Physics and Astronomy Classification Scheme
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90. GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS 
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91.   Solid Earth physics

91.10.-v   Geodesy and gravity

91.10.By   Mathematical geodesy; general theory 

91.10.Da   Cartography 

91.10.Fc   Space geodetic surveys 

91.10.Jf   Topography; geometric observations 

91.10.Kg   Crustal movements 

91.10.Lh   Photogrammetry 

91.10.Nj   Rotational variations; polar wobble 

91.10.Pp   Gravimetric measurements and instruments 

91.10.Qm   Harmonics of the gravity potential field 

... ... ...     Relations of gravity observations to tectonics and isostasy, see 91.45.Sx

91.10.Rn   Rheology of lithosphere and mantle 

91.10.Sp   Satellite orbits 

91.10.Tq   Earth tides 

91.10.Vr   Ocean/Earth/atmosphere interaction 

91.10.Ws   Reference systems 

91.25.-r   Geomagnetism and paleomagnetism; geoelectricity

91.25.Cw   Origins and models of the magnetic field; dynamo theories 

91.25.Dx   Archeomagnetism 

91.25.Ey   Interactions between exterior sources and interior properties 

91.25.Ga   Spatial variations: all harmonics and anomalies 

91.25.Jc   Spatial variations attributed to sea floor spreading 

91.25.Le   Time variations: diurnal to secular 

91.25.Mf   Reversals 

91.25.Ng   Paleomagnetism 

91.25.Ph   Magnetostratigraphy 

91.25.Qi   Geoelectricity; electromagnetic induction and conductivity (magnetotelluric effects) 

91.30.-f   Seismology

91.30.Bi   Seismic sources (mechanisms, magnitude, moment frequency spectrum) 

91.30.Dk   Seismicity: space and time distribution 

91.30.Fn   Surface and body waves 

91.30.Ks    Free oscillations (periods less than 12 hours) 

91.30.Mv   Strong motions and shock waves 

91.30.Nw   Tsunamis (for dynamics of oceans, see 92.10.Dh and 92.10.Fj)

91.30.Px   Phenomena related to earthquake prediction 

91.30.Rz   Explosion seismology 

91.30.Tb   Volcano seismology 

91.30.Vc   Continental crust seismology 

91.30.Ye   Oceanic crust seismology 

91.35.-x   Earth's interior structure and properties

91.35.Cb   Models of interior structure 

91.35.Dc   Heat flow; geothermy 

91.35.Ed   Structure of the Earth's interior below the upper mantle 

91.35.Gf   Structure of the crust and upper mantle 

91.35.Lj   Composition of Earth's interior 

91.35.Nm   Geochronology 

91.35.Pn   Tomography of the Earth's interior (see also 91.30.-f Seismology)

91.40.-k   Volcanology

91.40.Bp   Ash deposits 

91.40.Dr     Atmospheric effects (see also 92.60.Mt Particles and aerosols—in Meteorology)

91.40.Ft   Eruptions 

91.40.Hw   Lava 

91.45.-c   Physics of plate tectonics

91.45.Cg   Continental margins 

91.45.Dh   Plate tectonics 

91.45.Ei   Neotectonics 

91.45.Fj   Convection currents 

91.45.Pt   Slow vertical crustal movements (including isostasy and postglacial phenomena) 

91.45.Qv   Tomography of plate tectonics 

91.45.Sx   Relations of gravity observations to tectonics and isostasy 

91.45.Ty   Folds and Folding 

91.45.Vz   Fractures and faults 

91.45.Yb   Pluton emplacement 

91.50.-r   Marine geology and geophysics

91.50.Cw   Beach, coastal, and shelf processes 

91.50.Ey   Ocean bottom processes (for ocean basin thermometry, see 43.30.Qd—in acoustics appendix)

91.50.Ga   Bathymetry and noncoastal underwater morphology 

91.50.Jc   Turbidity currents, sedimentation (for acoustics of sediments, see 43.30.Ma—in acoustics appendix)

91.60.-x   Physical properties of rocks and minerals(for rheological properties of geological materials, see 83.50 and 83.80.Nb)

91.60.Ba   Elasticity, fracture, and flow 

91.60.Dc   Creep and deformation 

91.60.Ed   Crystal structure and defects 

91.60.Fe   Equations of state 

91.60.Gf   High-pressure behavior 

91.60.Hg   Phase changes 

91.60.Ki   Thermal properties 

91.60.Lj   Acoustic properties 

91.60.Mk   Optical properties 

91.60.Pn   Magnetic and electric properties 

91.65.-n   Geophysical aspects of geology, mineralogy, and petrology (for geophysical prospecting, see 43.40.Ph—in acoustics appendix)

91.65.Br   Geochemical cycles 

91.65.Dt   Isotopic composition/chemistry 

91.65.Fw   Low-temperature geochemistry 

91.65.Hy   Organic geochemistry 

91.65.Nd   Trace elements 

91.65.Rg   Mineral occurrences and deposits 

91.65.Ti   Sedimentary petrology 

91.65.Vj   Major element composition 

91.70.-c   Information related to geologic time

91.70.Bf   Cenozoic 

91.70.Dh   Mesozoic 

91.70.Fj   Paleozoic 

91.70.Hm   Precambrian 

91.90.+p   Other topics in solid Earth physics (restricted to new topics in section 91)

92.   Hydrospheric and atmospheric geophysics

92.10.-c   Physics of the oceans

92.10.Bf   Physical properties of seawater 

92.10.Cg    Capillary waves 

92.10.Dh   Dynamics of the deep ocean 

92.10.Ei   Coriolis effects 

92.10.Fj   Dynamics of the upper ocean 

92.10.Gk   El Nino 

92.10.Hm   Surface waves, tides, and sea level 

92.10.Jn   Seiches 

92.10.Kp   Sea–air energy exchange processes 

92.10.Lq   Turbulence and diffusion 

92.10.Mr   Thermohaline structure and circulation 

92.10.Ns   Fine structure and microstructure 

92.10.Pt   Optical properties of sea water 

92.10.Rw   Sea ice 

92.10.Sx   Coastal and estuarine oceanography 

92.10.Ty   Fronts and jets 

92.10.Vz   Underwater sound (see also 43.30 in acoustics)

92.10.Wa   Sediment transport 

92.10.Yb   Hydrography (for ocean parameter estimation by acoustical methods, see 43.30.Pc—in acoustics appendix)

... ... ...     Marine geology and geophysics, see 91.50

92.20.-h   Interdisciplinary aspects of oceanography

92.20.Bk   Aerosols 

92.20.Cm   Chemistry of the ocean 

92.20.Gr   Ocean energy extraction 

92.20.Hs   Anoxic environments 

92.20.Jt   Biological aspects of oceanography 

92.20.Kv   Photochemistry 

92.20.Lw   Photosynthesis 

92.20.Mx   Physicochemical properties 

92.20.Ny   Marine pollution 

92.20.Pz   Bacteria 

92.20.Rb   Plankton 

92.20.Td   Radioactivity 

92.40.-t   Hydrology and glaciology

92.40.Cy   Modeling; general theory 

92.40.Ea     Precipitation 

92.40.Fb   Rivers, runoff, and streamflow 

92.40.Gc   Erosion and sedimentation 

92.40.Je   Evaporation 

92.40.Kf   Groundwater 

92.40.Lg   Soil moisture 

92.40.Ni   Limnology 

92.40.Qk   Water quality and water resources 

92.40.Rm   Snow 

92.40.Sn   Ice 

92.40.Vq   Glaciers 

92.60.-e   Meteorology (see also 43.28 Aeroacoustics and atmospheric sound, 42.68 atmospheric optics, 94.10.Dy Atmospheric structure, pressure, density, and temperature)

92.60.Bh   General circulation 

92.60.Dj   Gravity waves, tides, and compressional waves 

92.60.Ek   Convection, turbulence, and diffusion 

92.60.Fm   Boundary layer structure and processes 

92.60.Gn   Winds and their effects 

92.60.Hp   Chemical composition and chemical interactions 

92.60.Jq   Water in the atmosphere (humidity, clouds, evaporation, precipitation) 

92.60.Ls   Ionic interactions and processes 

92.60.Mt   Particles and aerosols (see also 94.20 Physics of the ionosphere)

92.60.Nv   Cloud physics; stratus and cumulus clouds 

92.60.Pw   Atmospheric electricity 

92.60.Qx   Storms 

92.60.Ry   Climatology 

92.60.Sz   Air quality and air pollution 

92.60.Ta   Interaction of atmosphere with electromagnetic waves; propagation 

92.60.Vb   Solar radiation 

92.60.Wc   Weather analysis and prediction 

92.70.-j   Global change (see also 92.60 Meteorology)

92.70.Cp   Atmosphere 

92.70.Er   Biogeochemical processes 

92.70.Gt   Climate dynamics 

92.70.Jw   Oceans 

92.70.Ly   Water cycles 

92.90.+x   Other topics in hydrospheric and atmospheric geophysics (restricted to new topics in section 92)

93.   Geophysical observations, instrumentation, and techniques

93.30.-w   Information related to geographical regions

93.30.Bz   Africa 

93.30.Ca   Antarctica 

93.30.Db   Asia 

93.30.Fd   Australia 

93.30.Ge   Europe

93.30.Hf   North America 

93.30.Jg   South America 

93.30.Kh   Large islands (e.g., Greenland) 

93.30.Li   Arctic Ocean 

93.30.Mj   Atlantic Ocean 

93.30.Nk   Indian Ocean 

93.30.Pm   Pacific Ocean 

93.30.Qn   Southern Ocean 

93.30.Rp   Regional seas 

93.30.Sq   Polar regions 

93.30.Tr   Temperate regions 

93.30.Vs   Tropical regions 

93.55.+z   International organizations, national and international programs

93.65.+e   Data acquisition and storage

93.85.+q   Instrumentation and techniques for geophysical research

94.   Aeronomy and magnetospheric physics

94.10.-s   Physics of the neutral atmosphere (for atmospheres of the planets, see 96.35.H)

94.10.Bw   General properties of the high atmosphere 

94.10.Dy   Atmospheric structure, pressure, density, and temperature (stratosphere, mesosphere, thermosphere, exosphere) (see also 92.60 Meteorology and 92.70 Global change)

94.10.Fa   Atmospheric composition (atomic or molecular), chemical reactions and processes (see also 82.33.Tb Atmospheric chemistry in physical chemistry and chemical physics)

94.10.Gb   Absorption and scattering of radiation 

94.10.Jd   Tides, waves, and winds 

94.10.Lf   Convection, diffusion, mixing, turbulence, and fallout 

94.10.Nh   Cosmic dust 

94.10.Rk   Aurora and airglow 

94.20.-y   Physics of the ionosphere (for ionospheres of the planets, see 96.35.Kx; for radiowave propagation, see 41.20.Jb in electromagnetism, see also 52 Physics of plasmas and electric discharges)

94.20.Bb   Wave propagation 

94.20.Dd   Ionospheric structure (D, E, F, and topside regions) including steady-state ion densities and temperatures 

94.20.Ee   D region 

94.20.Gg   E region 

94.20.Ji   F region 

94.20.Kj   Polar cap ionosphere 

94.20.Lk   Topside region 

94.20.Mm   Plasmasphere 

94.20.Pp   Plasmapause 

94.20.Qq   Particle precipitation 

94.20.Rr   Interactions between waves and particles 

94.20.Ss   Electric fields 

94.20.Tt   Ionospheric soundings 

94.20.Vv   Ionospheric disturbances and modifications 

94.20.Ww   Plasma motion, convection, or circulation 

94.20.Yx   Interaction between ionosphere and magnetosphere 

94.30.-d   Physics of the magnetosphere (for magnetospheres of the planets, see 96.35.Kx; for radiowave propagation,see 41.20.Jb in electromagnetism; see also 52 Physics of plasmas and electric discharges)

94.30.Bg   Magnetic coordinate systems 

94.30.Ch   Magnetospheric configuration 

94.30.Di   Magnetopause 

94.30.Ej   Magnetic tail 

94.30.Fk    Plasma motion, convection, or circulation 

94.30.Gm   Plasma instabilities 

94.30.Hn   Trapped particles 

94.30.Jp   Ring currents 

94.30.Kq   Electric fields 

94.30.Lr   Magnetic storms, substorms 

94.30.Ms   Magnetic pulsations 

94.30.Tz   Waves: propagation and excitation 

94.30.Va   Magnetosheath; interaction with interplanetary space (including solar wind) (for cosmic-ray interactions, see 13.85.Tp in elementary particle physics; see also 96.40 Cosmic rays—in Astronomy)

94.80.+g   Instrumentation for aeronomy and magnetospheric studies (see also 95.55.-n Astronomical and space-research instrumentation in astronomy; 07.87.+v spaceborne and space research instruments, apparatus, and components)

94.90.+m    Other topics in aeronomy and magnetospheric physics (restricted to new topics in section 94)

95.   Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations

95.10.-a   Fundamental astronomy

95.10.Ce   Celestial mechanics (including n-body problems) (see also 45.50.Pk in classical mechanics of discrete systems)

... ... ...     Dynamics and kinematics of stellar systems, see 98.10

95.10.Eg   Orbit determination and improvement 

95.10.Fh   Chaotic dynamics (see also 05.45.-a Nonlinear dynamics and nonlinear dynamical systems)

95.10.Gi   Eclipses, transits, and occultations 

95.10.Jk   Astrometry and reference systems 

95.10.Km   Ephemerides, almanacs, and calendars 

95.30.-k    Fundamental aspects of astrophysics

95.30.Cq   Elementary particle processes (see also 26 Nuclear astrophysics)

95.30.Dr   Atomic processes and interactions (see also 32 Atomic properties and interactions with photons; 34 Atomic and molecular collision processes and interactions)

95.30.Ft   Molecular and chemical processes and interactions; (see also 33 Molecular properties and interactions with photons; 34 Atomic and molecular collision processes and interactions)

95.30.Gv   Radiation mechanisms; polarization 

95.30.Jx   Radiative transfer; scattering 

95.30.Ky   Atomic and molecular data, spectra, and spectral parameters (opacities, rotation constants, line identification, oscillator strengths, gf values, transition probabilities, etc.) (see also 32.10, 32.30, 32.70, 33.15, 33.20, 33.20, and 33.70 in atomic and molecular physics)

95.30.Lz   Hydrodynamics 

95.30.Qd   Magnetohydrodynamics and plasmas  (see also 52.30.Cv and 52.72.+v in physics of plasmas)

95.30.Sf   Relativity and gravitation (see also 04 General relativity and gravitation, 98.80.Hw Mathematical and relativistic cosmology)

95.30.Tg   Thermodynamic processes, conduction, convection, equations of state (see also 05.70 Thermodynamics)

95.30.Wi Dust processes (condensation, evaporation, sputtering, mantle growth, etc.) 

95.35.+d   Dark matter (stellar, interstellar, galactic, and cosmological) (see also 95.30.Cq Elementary particle processes; for brown dwarfs, see 97.20.Vs; for galactic halos, see 98.35.Gi or 98.62.Gq; for models of the early Universe, see 97.10.Fy)

95.40.+s   Artificial Earth satellites (for lunar and planetary probes, see 95.55.Pe)

95.45.+i   Observatories and site testing

95.55.-n   Astronomical and space-research instrumentation (see also 94.80 Instrumentation for aeronomy and magnetospheric studies, 07.87 Spaceborne and space research instruments, apparatus, and components)

95.55.Aq   Charge-coupled devices, image detectors, and IR detector arrays (see also 85.60.Gz Photodetectors)

95.55.Br   Astrometric and interferometric instruments 

95.55.Cs   Ground-based ultraviolet, optical and infrared telescopes 

95.55.Ev   Solar instruments 

95.55.Fw   Space-based ultraviolet, optical, and infrared telescopes 

95.55.Jz   Radio telescopes and instrumentation; heterodyne receivers 

95.55.Ka   X- and gamma-ray telescopes and instrumentation 

95.55.Pe   Lunar, planetary, and deep-space probes 

95.55.Qf   Photometric, polarimetric, and spectroscopic instrumentation (see also 07.60.-j Optical instruments, equipment, and techniques)

95.55.Rg    Photoconductors and bolometers (see also 07.57.Kp Bolometers, infrared submillimeter wave, microwave, and radiowave receivers and detectors)

95.55.Sh   Auxiliary and recording instruments; clocks and frequency standards 

95.55.Vj   Neutrino, muon, pion, and other elementary particle detectors; cosmic ray detectors (see also 29.40.-n Radiation detectors—in nuclear physics)

95.55.Ym   Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques (see also 04.80.-y Experimental studies of gravity in general relativity and gravitation)

95.75.-z   Observation and data reduction techniques; computer modeling and simulation

95.75.De   Photography and photometry (including microlensing techniques) 

95.75.Fg   Spectroscopy and spectrophotometry 

95.75.Hi   Polarimetry 

95.75.Kk   Interferometry 

95.75.Mn   Image processing (including source extraction) 

95.75.Pq   Mathematical procedures and computer techniques 

95.75.Qr   Adaptive and segmented optics (see also 42.68.Wt Atmospheric optics)

95.75.Rs   Remote observing techniques 

95.75.Tv    Digitization techniques (see also 07.05.Pj Image processing)

95.75.Wx    Time series analysis, time variability 

95.80.+p   Astronomical catalogs, atlases, sky surveys, databases, retrieval systems, archives, etc.

95.85.-e   Astronomical observations (additional primary heading(s) must be chosen with these entries to represent the astronomical objects and/or properties studied)

95.85.Bh   Radio, microwave ( >1 mm) 

95.85.Fm   Submillimeter (300 micrometers–1 mm) 

95.85.Gn   Far infrared (10 –300 micrometers) 

95.85.Hp   Infrared (3–10 micrometers) 

95.85.Jq    Near infrared (0.75–3 micrometers) 

95.85.Kr   Visible (390–750 nm) 

95.85.Ls   Near ultraviolet (300–390 nm) 

95.85.Mt   Ultraviolet (10–300 nm) 

95.85.Nv   X-ray 

95.85.Pw   Gamma-ray 

95.85.Ry   Neutrino, muon, pion, and other elementary particles; cosmic rays 

95.85.Sz    Gravitational radiation, magnetic fields, and other observations 

95.90.+v   Historical astronomy and archaeoastronomy; and other topics in fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations

96.   Solar System (for the Earth, see 91–94)

96.10.+i   General, solar nebula, and cosmogony

96.20.-n   Moon

96.20.Br   Origin, formation, and age 

96.20.Dt   Features, landmarks, mineralogy, petrology, and atmosphere 

96.20.Jz   Gravitational field, selenodesy, magnetic fields 

96.20.Ka   Cratering 

96.30.-t   Planets, their satellites and rings; asteroids( for comets, see 96.50.Gn)

96.30.Dz   Mercury 

96.30.Ea   Venus 

96.30.Gc   Mars 

96.30.Kf   Jupiter 

96.30.Mh   Saturn 

96.30.Pj   Uranus 

96.30.Rm   Neptune 

96.30.Sn   Pluto 

96.30.Wr   Planetary rings 

96.30.Ys   Asteroids (minor planets) 

96.35.-j   Planetary, asteroid, cometary, and satellite characteristics and properties (see also 97.82 for extrasolar planetary systems)

96.35.Cp   Origin, formation, evolution, and ages 

96.35.Er   Chemical composition 

96.35.Fs   Mass, size; gravitational fields; rotation; orbits 

96.35.Gt   Surface features, cratering, and topography 

96.35.Hv   Neutral atmospheres 

96.35.Kx   Ionospheres; magnetospheres 

96.35.Mz   Interiors 

96.35.Na   Volcanism and tectonics 

96.35.Pb   Electric and magnetic fields 

96.35.Se   Interplanetary comparisons 

96.40.-z   Cosmic rays (for cosmic rays outside the Solar System, see 98.70.Sa)

96.40.Cd   Interplanetary propagation and effects 

96.40.De   Composition, energy spectra, and interactions 

96.40.Fg   Energetic solar particles and photons 

96.40.Kk   Solar modulation and geophysical effects 

96.40.Pq   Extensive air showers 

96.40.Tv   Neutrinos and muons 

96.40.Vw   Cosmic-ray effects in meteorites and terrestrial matter 

96.50.-e   Interplanetary space (for asteroids, see 96.30.Ys)

96.50.Bh   Solar electric and magnetic fields (including solar wind fields) 

96.50.Ci   Solar wind plasma 

96.50.Dj   Interplanetary gas and dust (including gegenschein and zodiacal light) 

96.50.Ek   Solar wind interactions with planets, satellites, and comets (for interactions with Earth, see 94.30.Va)

96.50.Fm   Shock waves 

96.50.Gn   Comets 

96.50.Hp    Oort cloud 

96.50.Jq    Kuiper belt 

96.50.Kr   Meteors, meteoroids, and meteor streams 

96.50.Mt   Meteorites, micrometeorites, and tektites 

96.50.Pw   Particle acceleration 

96.50.Qx   Stream-stream interactions 

96.50.Ry   Waves and discontinuities 

96.60.-j   Solar physics

96.60.Bn   Diameter, figure, rotation, mass 

96.60.Fs   Chemical composition 

96.60.Hv   Electric and magnetic fields 

96.60.Jw   Solar interior (for solar neutrinos, see 26.65.+t in nuclear astrophysics) 

96.60.Ly   Oscillations and waves; helioseismology 

96.60.Mz   Photosphere, granulation 

96.60.Na   Chromosphere and chromosphere–corona transition; spicules 

96.60.Pb   Corona; coronal loops, streamers, and holes 

96.60.Qc   Sunspots, faculae, plages 

96.60.Rd   Flares, bursts, and related phenomena 

96.60.Se   Prominences 

96.60.Tf   Solar electromagnetic radiation (see also 92.60.Vb Solar radiation in meteorology )

96.60.Vg   Particle radiation, solar wind (see also 96.50.Ci Solar wind plasma and 96.50.Ek Solar wind interactions with planets, satellites, and comets)

96.60.Wh   Coronal mass ejection 

96.90.+c   Other topics on the solar system

(restricted to new topics in section 96)

97.   Stars

97.10.-q    Stellar characteristics and properties (see also 04.40.Dg Relativistic stars) in general relativity and gravitation and section 26 Nuclear astrophysics)

97.10.Bt   Star formation 

97.10.Cv   Stellar structure, interiors, evolution, nucleosynthesis, ages 

97.10.Ex   Stellar atmospheres (photospheres, chromospheres, coronae, magnetospheres); radiative transfer; opacity and line formation 

97.10.Fy   Circumstellar shells, clouds, and expanding envelopes; circumstellar masers (for interstellar masers, see 98.38.Er or 98.58.Ec)

97.10.Gz   Accretion and accretion disks 

97.10.Jb   Stellar activity 

97.10.Kc   Stellar rotation 

97.10.Ld   Magnetic and electric fields; polarization of starlight 

97.10.Me   Mass loss and stellar winds 

97.10.Nf   Masses 

97.10.Pg   Radii 

97.10.Qh    Surface features (including starspots) 

97.10.Ri   Luminosities; magnitudes; effective temperatures, colors, and spectral classification 

97.10.Sj   Pulsations, oscillations, and stellar seismology 

97.10.Tk   Abundances, chemical composition 

97.10.Vm   Distances, parallaxes 

97.10.Wn   Proper motions and radial velocities (line-of-sight velocities); space motions (see also 95.10.Jk Astrometry and reference systems)

97.10.Xq   Luminosity and mass functions 

97.10.Yp   Star counts, distribution, and statistics 

97.10.Zr    Hertzsprung-Russell, color- magnitude, and color-color diagrams 

97.20.-w   Normal stars (by class): general or individual

97.20.Ec   Main-sequence: early-type stars (O and B) 

97.20.Ge   Main-sequence: intermediate-type stars (A and F) 

97.20.Jg   Main-sequence: late-type stars (G, K, and M) 

97.20.Li   Giant and subgiant stars 

97.20.Pm   Supergiant stars 

97.20.Rp   Faint blue stars (including blue stragglers), white dwarfs, degenerate stars, nuclei of planetary nebulae (for planetary nebulae, see 98.38.Ly or 98.58.Li)

97.20.Tr   Population II stars (horizontal branch, metal poor, etc.) 

97.20.Vs   Low luminosity stars, subdwarfs, and brown dwarfs 

97.20.Wt   Population III stars 

97.21.+a   Pre-main sequence objects, young stellar objects (YSO's) and protostars (T Tauri stars, Orion population, Herbig–Haro objects, Bok globules, bipolar outflows, cometary nebulae, etc.) (see also 98.38.Fs and 98.58.Fd Jets, outflows and bipolar flows in the Milky Way and external galaxies)

97.30.-b   Variable and peculiar stars (including novae)

97.30.Dg   Low-amplitude blue variables (alpha Cygni, beta Cephei, delta Scuti, delta Delphini, delta Canis Majoris, SX Phoenicius, etc.) 

97.30.Eh   Emission-line stars (Of, Be, Luminous Blue Variables, Wolf–Rayet, etc.) 

97.30.Fi   Chemically peculiar stars (Ap, Am, etc.) 

97.30.Gj   Cepheids (delta Cephei, W Virginis) 

97.30.Hk   Carbon stars, S stars, and related types (C, S, R, and N) 

97.30.Jm   Long-period variables (Miras) and semiregulars 

97.30.Kn   RR Lyrae stars; RV Tauri and PV Telescopii variables 

97.30.Nr   Flare stars (UV Ceti, RS Canum Venaticorum, FU Orionis, R Coronae Borealis variables, etc.) 

97.30.Qt   Novae, dwarf novae, recurrent novae,and other cataclysmic (eruptive) variables (see also 97.80.Gm, Jp Cataclysmic binaries and X-ray binaries)

97.30.Sw   Unusual and peculiar variables 

97.60.-s   Late stages of stellar evolution (including black holes) (see also 04.40.Dg Relativistic stars)

97.60.Bw   Supernovae (see also 26.30.+k Nucleosynthesis in novae, supernovae and other explosive stars and 26.50.+x Nuclear physics aspects of supernovae evolution)

97.60.Gb   Pulsars 

97.60.Jd   Neutron stars (see also 26.60.+c Nuclear matter aspects of neutron stars)

97.60.Lf   Black holes (see also 04.70.-s Physics of black holes in general relativity and gravitation;  for galactic black holes, see 98.35.Jk and 98.62.Js)

97.80.-d   Binary and multiple stars

97.80.Af   Astrometric and interferometric binaries 

97.80.Di   Visual binaries 

97.80.Fk   Spectroscopic binaries; close binaries 

97.80.Gm   Cataclysmic binaries (novae, dwarf novae, recurrent novae, and nova-like objects); symbiotic stars (see also 97.30.Qt Novae)

97.80.Hn   Eclipsing binaries

97.80.Jp   X-ray binaries (see also 98.70.Qy  X-ray sources and 97.60.Gb Pulsars)

97.80.Kq   Multiple stars 

97.82.-j   Extrasolar planetary systems

97.82.Cp   Photometric and spectroscopic detection; coronographic detection; interferometric detection 

97.82.Fs   Substellar companions; planets 

97.82.Jw   Infrared excess; debris disks; protoplanetary disks; exo-zodiacal dust 

97.90.+j   Other topics on stars (restricted to new topics in section 97)

98.   Stellar systems; interstellar medium; galactic and extragalactic objects and systems; the Universe

98.10.+z   Stellar dynamics and kinematics

98.20.-d   Stellar clusters and associations

98.20.Af   Associations of stars (OB, T, R) in the Milky Way 

98.20.Bg   Associations of stars (OB, T, R) in external galaxies 

98.20.Di   Open clusters in the Milky Way 

98.20.Fk   Open clusters in external galaxies 

98.20.Gm   Globular clusters in the Milky Way 

98.20.Jp   Globular clusters in external galaxies 

98.35.-a   Characteristics and properties of the Milky Way galaxy

98.35.Ac   Origin, formation, evolution, age,and star formation 

98.35.Bd   Chemical composition and chemical evolution 

98.35.Ce   Mass and mass distribution 

98.35.Df   Kinematics, dynamics, and rotation 

98.35.Eg   Electric and magnetic fields 

98.35.Gi   Galactic halo 

98.35.Hj   Spiral arms and galactic disk 

98.35.Jk   Galactic center, bar, circumnuclear matter, and bulge (including black hole and distance measurements) (see also 04.70.-s Physics of black holes in general relativity and gravitation) 

98.35.Ln   Stellar content and populations; morphology and overall structure 

98.35.Mp   Infall and accretion 

98.35.Nq   Galactic winds and fountains 

98.35.Pr   Solar neighborhood 

98.38.-j   Interstellar medium (ISM) and nebulae in Milky Way

98.38.Am   Physical properties (abundances, electron density, magnetic fields, scintillation, scattering, kinematics, dynamics, turbulence, etc.) 

98.38.Bn   Atomic, molecular, and chemical, and grain processes 

98.38.Cp   Interstellar dust grains; diffuse emission; infrared cirrus 

98.38.Dq   Molecular clouds, H2 clouds, dense clouds, and dark clouds 

98.38.Er   Interstellar masers (for circumstellar masers, see 97.10.Fy)

98.38.Fs   Jets, outflows, and bipolar flows (for pre-main sequence objects, see 97.21)

98.38.Gt   H I regions and 21-cm lines; diffuse, translucent, and high-velocity clouds 

98.38.Hv   H II regions; emission and reflection nebulae 

98.38.Jw   Infrared emission 

98.38.Kx   Intercloud medium (ICM); hot and highly ionized gas; bubbles 

98.38.Ly   Planetary nebulae (for nuclei of planetary nebulae, see also 97.20.Rp)

98.38.Mz   Supernova remnants 

98.52.-b   Normal galaxies; extragalactic objects and systems (by type)

98.52.Cf   Classification and classification systems 

98.52.Eh   Elliptical galaxies 

98.52.Lp   Lenticular (S0) galaxies 

98.52.Nr   Spiral galaxies 

98.52.Sw   Irregular and morphologically peculiar galaxies 

98.52.Wz   Dwarf galaxies (elliptical, irregular, and spheroidal) 

98.54.-h   Quasars; active or peculiar galaxies, objects, and systems

98.54.Aj   Quasars (for quasar absorption and emission-line systems; Lyman forest see 98.62.Ra)

98.54.Cm   Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei) 

98.54.Ep   Starburst galaxies and infrared excess galaxies 

98.54.Gr   Radio galaxies 

98.54.Kt   Protogalaxies; primordial galaxies 

98.56.-p   Local group; Magellanic Clouds

98.56.Ew   Elliptical galaxies 

98.56.Ne   Spiral galaxies (M31 and M33) 

98.56.Si   Magellanic Clouds and other irregular galaxies 

98.56.Tj   Magellanic stream 

98.56.Wm  Dwarf galaxies (elliptical, irregular, and spheroidal) 

98.58.-w   Interstellar medium (ISM) and nebulae in external galaxies

98.58.Ay   Physical properties (abundances, electron density, magnetic fields, scintillation, scattering, kinematics, dynamics, turbulence, etc.) 

98.58.Bz   Atomic, molecular, chemical, and grain processes 

98.58.Ca   Interstellar dust grains; diffuse emission; infrared cirrus 

98.58.Db   Molecular clouds, H2 clouds, dense clouds, and dark clouds

98.58.Ec   Interstellar masers (for circumstellar masers, see 97.10.Fy)

98.58.Fd   Jets, outflows and bipolar flows (for pre-main sequence objects, see 97.21)

98.58.Ge   H I regions and 21-cm lines; diffuse, translucent, and high-velocity clouds 

98.58.Hf   H II regions; emission and reflection nebulae 

98.58.Jg   Infrared emission 

98.58.Kh   Intercloud medium (ICM); hot and highly ionized gas; bubbles 

98.58.Li   Planetary nebulae (for nuclei of planetary nebulae, see also 97.20.Rp)

98.58.Mj   Supernova remnants 

98.58.Nk   Tidal tails; H I shells 

98.62.-g   Characteristics and properties of external galaxies and extragalactic objects (for the Milky Way, see 98.35)

98.62.Ai   Origin, formation, evolution, age, and star formation 

98.62.Bj   Chemical composition and chemical evolution 

98.62.Ck   Masses and mass distribution 

98.62.Dm   Kinematics, dynamics, and rotation 

98.62.En   Electric and magnetic fields 

98.62.Gq   Galactic halos 

98.62.Hr   Spiral arms and bars; galactic disks 

98.62.Js   Galactic nuclei (including black holes), circumnuclear matter, and bulges (see also 04.70.-s Physics of black holes in general relativity and gravitation) 

98.62.Lv   Stellar content and populations; radii; morphology and overall structure 

98.62.Mw   Infall, accretion, and accretion disks (see also 04.70.-s Physics of black holes  in general relativity and gravitation) 

98.62.Nx   Jets and bursts; galactic winds and fountains 

98.62.Py   Distances, redshifts, radial velocities; spatial distribution of galaxies (see also 98.80.Es Observational cosmology)

98.62.Qz   Magnitudes and colors; luminosities 

98.62.Ra   Intergalactic matter; quasar absorption and emission-line systems; Lyman forest (for quasars see 98.54.Aj; for intracluster matter see 98.65.Hb)

98.62.Sb   Gravitational lenses and luminous arcs (see also 95.30.Sf Relativity and gravitation)

98.62.Tc   Astrometry; identification 

98.62.Ve  Statistical and correlative studies of properties (luminosity and mass functions; mass-to-light ratio; Tully- Fisher relation, etc.) 

98.65.-r   Galaxy groups, clusters, and superclusters; large scale structure of the Universe

98.65.At   Interacting galaxies; galaxy pairs, and triples 

98.65.Bv   Small and compact galaxy groups 

98.65.Cw   Galaxy clusters 

98.65.Dx   Superclusters; large-scale structure of the Universe (including voids, pancakes, great wall, etc.) 

98.65.Fz    Galaxy mergers, collisions, and tidal interactions 

98.65.Hb   Intracluster matter; cooling flows 

98.70.-f   Unidentified sources of radiation outside the Solar System (for cosmic rays in the Solar System, see 96.40;  for pulsars, see 97.60.Gb)

98.70.Dk  Radio sources 

... ... ...     Quasars, see 98.54.Aj

98.70.Lt   IR sources (for IR sources in interstellar medium, see 98.38.Jw and/or 98.58.Jg)

98.70.Qy   X-ray sources; X-ray bursts (see also 97.30.Qt Novae, dwarf novae, 97.80.Jp X-ray binaries)

98.70.Rz   Gamma-ray sources; gamma-ray bursts 

98.70.Sa   Cosmic rays (including sources, origin, acceleration, and interactions) 
                      (see also 26.40.+r Cosmic ray nucleosynthesis in nuclear astrophysics) 

98.70.Vc   Background radiations 

98.80-k   Cosmology (see also 04 General relativity and gravitation; for origin and evolution of galaxies, see 98.62.Ai; for elementary particle and nuclear processes, see 95.30.Cq; for dark matter, see 95.35.; for superclusters and large-scale structure of the Universe, see 98.65.Dx)

98.80.Bp   Origin and formation of the Universe 

98.80.Cq   Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) 

98.80.Es   Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc) 

98.80.Ft   Origin, formation, and abundances of the elements (see also 26.35 Big Bang nucleosynthesis)

98.80.Hw   Mathematical and relativistic aspects of cosmology; quantum cosmology (see also 04.60 Quantum gravity  in general relativity and gravitation) 

98.90.+s   Other topics on stellar systems; interstellar medium; galactic and extragalactic objects and systems; the Universe (restricted to new topics in section 98)

99.10.+g   Errata

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