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\section*{Thesaurus of key words used in the annual subject indexes
(valid from January 1997)}
\indent
\indent
The list is common to {\itshape Astronomy and Astrophysics}, {\itshape The
Astrophysical Journal} and {\itshape Monthly Notices of the Royal
Astronomical Society}. In order to ease the search, the key words are
subdivided into broad categories.

\medskip
No more than {\itshape six} codes all together should be listed for a paper
as this is the limit fixed by the computer program.

\medskip
The key words in boldface listed under the code numbers 07.03.2,
07.16.2, 08.09.2, 08.16.5, 08.19.5, 09.09.1, 09.16.2, 10.07.3, 10.15.2,
11.02.2, 11.09.1, 11.17.4 are intended for use with specific
astronomical objects; each contains the word ``individual". The
corresponding code numbers should never be used alone, but always in
combination with the most common names for the astronomical objects in
question. For example, if a paper discusses three individual galaxies,
these should be coded on the title page of the manuscript in the
following manner:

\medskip
11.09.1 Arp 220; 11.09.1 M 51; 11.09.1 NGC 4472

\medskip\noindent
Note that each object (in the example the three galaxies) counts
as one code within the allowed limit of  six codes.

\medskip
The parts of the key words in italics are for reference only and should
be omitted when the key words are entered on the manuscript.

\section*{General}
\begin{description}[01.01.10]
\item[01.02.1] Book reviews
\item[01.05.1] Editorials notices
\item[01.05.2] Errata, addenda
\item[01.05.3] Extraterrestrial intelligence
\item[01.08.1] History and philosophy of astronomy
\item[01.13.1] Miscellaneous
\item[01.15.1] Obituaries, biographies
\end{description}
\section*{Physical data and processes}
\begin{description}[01.01.10]
\item[02.01.1] Acceleration of particles
\item[02.01.2] Accretion, accretion disks
\item[02.01.3] Atomic data
\item[02.01.4] Atomic processes
\item[02.02.1] Black hole physics
\item[02.03.1] Chaos
\item[02.03.2] Conduction
\item[02.03.3] Convection
\item[02.03.4] Cosmic strings
\item[02.04.1] Dense matter
\item[02.04.2] Diffusion
\item[02.05.1] Elementary particles
\item[02.05.2] Equation of state
\item[02.07.1] Gravitation
\item[02.07.2] Gravitational waves
\item[02.08.1] Hydrodynamics
\item[02.09.1] Instabilities
\item[02.12.1] Line: formation
\item[02.12.2] Line: identification
\item[02.12.3] Line: profiles
\item[02.13.1] Magnetic fields
\item[02.13.2] {\itshape Magnetohydrodynamics} (MHD)
\item[02.13.3] Masers
\item[02.13.4] Molecular data
\item[02.13.5] Molecular processes
\item[02.14.1] Nuclear reactions, nucleosynthesis, abundances
\item[02.16.1] Plasmas
\item[02.16.2] Polarization
\item[02.18.5] Radiation mechanisms: non-thermal
\item[02.18.6] Radiation mechanisms: thermal
\item[02.18.7] Radiative transfer
\item[02.18.8] Relativity
\item[02.19.2] Scattering
\item[02.19.1] Shock waves
\item[02.20.1] Turbulence
\item[02.23.1] Waves
\end{description}
\section*{Astronomical instrumentation, methods and
techniques}
\begin{description}[01.01.10]
\item[03.01.2] Atmospheric effects
\item[03.02.1] Balloons
\item[03.09.1] Instrumentation: detectors
\item[03.09.2] Instrumentation: interferometers
\item[03.09.3] Instrumentation: miscellaneous
\item[03.09.4] Instrumentation: photometers
\item[03.09.5] Instrumentation: polarimeters
\item[03.09.6] Instrumentation: spectrographs
\item[03.13.1] Methods: analytical
\item[03.13.2] Methods: data analysis
\item[03.13.7] Methods: laboratory
\item[03.13.3] Methods: miscellaneous
\item[03.13.4] Methods: numerical
\item[03.13.5] Methods: observational
\item[03.13.6] Methods: statistical
\item[03.19.1] Site testing
\item[03.19.2] Space vehicles
\item[03.20.1] Techniques: image processing
\item[03.20.2] Techniques: interferometric
\item[03.20.3] Techniques: miscellaneous
\item[03.20.4] Techniques: photometric
\item[03.20.5] Techniques: polarimetric
\item[03.20.6] Techniques: radar astronomy
\item[03.20.7] Techniques: radial velocities
\item[03.20.8] Techniques: spectroscopic
\item[03.20.9] Telescopes
\end{description}
\section*{Astronomical data bases}
\begin{description}[01.01.10]
\item[04.01.1] Astronomical data bases: miscellaneous
\item[04.01.2] Atlases
\item[04.03.1] Catalogs
\item[04.19.1] Surveys
\end{description}
\section*{Astrometry and celestial mechanics}
\begin{description}[01.01.10]
\item[05.01.1] Astrometry
\item[05.03.1] Celestial mechanics, stellar dynamics
\item[05.05.1] Eclipses
\item[05.05.2] Ephemerides
\item[05.15.1] Occultations
\item[05.18.1] Reference systems
\item[05.20.1] Time
\end{description}
\section*{The Sun}
\begin{description}[01.01.10]
\item[06.01.1] Sun: abundances
\item[06.01.2] Sun: activity
\item[06.01.3] Sun: atmosphere
\item[06.03.1] Sun: chromosphere
\item[06.03.2] Sun: corona
\item[06.05.1] Sun: evolution
\item[06.06.1] Sun: faculae, plages
\item[06.06.2] Sun: filaments
\item[06.06.3] Sun: flares
\item[06.06.4] Sun: fundamental parameters
\item[06.07.1] Sun: general
\item[06.07.2] Sun: granulation
\item[06.09.2] Sun: infrared
\item[06.09.1] Sun: interior
\item[06.13.1] Sun: magnetic fields
\item[06.15.1] Sun: oscillations
\item[06.16.1] Sun: particle emission
\item[06.16.2] Sun: photosphere
\item[06.16.3] Sun: prominences
\item[06.18.1] Sun: radio radiation
\item[06.18.2] Sun: rotation
\item[06.19.1] ({\itshape Sun:}) solar-terrestrial relations
\item[06.19.2] ({\itshape Sun:}) solar wind
\item[06.19.3] ({\itshape Sun:}) sunspots
\item[06.20.1] Sun: transition region
\item[06.21.1] Sun: UV radiation
\item[06.24.1] Sun: X-rays, gamma rays
\end{description}
\section*{Solar system}
\begin{description}[01.01.10]
\item[07.03.1] Comets: general
\item[07.03.2] {\bf Comets: individual: $\ldots$}
\item[07.05.1] Earth
\item[07.09.1] Inteplanetary medium
\item[07.13.1] Meteors, meteoroids
\item[07.13.2] Minor planets, asteroids
\item[07.13.3] Moon
\item[07.16.1] Planets and satellites: general
\item[07.16.2] {\bf Planets and satellites: \hfill\break
individual: $\ldots$} {\itshape (alphabetic order)}
\item[07.19.1] Solar system: formation
\item[07.19.2] Solar system: general
\end{description}
\section*{Stars}
\begin{description}[01.01.10]
\item[08.01.1] Stars: abundances
\item[08.01.2] Stars: activity
\item[08.16.4] Stars: AGB and post-AGB
\item[08.01.3] Stars: atmospheres
\item[08.02.1] {\itshape (Stars:)} binaries {\itshape (including multiple):}
close
\item[08.02.2] {\itshape (Stars:)} binaries: eclipsing
\item[08.02.3] {\itshape (Stars:)} binaries: general
\item[08.02.4] {\itshape (Stars:)} binaries: spectroscopic
\item[08.02.5] {\itshape (Stars:)} binaries: symbiotic
\item[08.02.6] {\itshape (Stars:)} binaries: visual
\item[08.02.7] {\itshape (Stars:)} blue stragglers
\item[08.03.1] Stars: carbon
\item[08.03.2] Stars: chemically peculiar
\item[08.03.3] Stars: chromospheres
\item[08.03.4] {\itshape (Stars:)} circumstellar matter
\item[08.03.5] Stars: coronae
\item[08.04.1] Stars: distances
\item[08.05.1] Stars: early-type
\item[08.05.2] Stars: emission-line, Be
\item[08.05.3] Stars: evolution
\item[08.06.1] Stars: flare
\item[08.06.2] Stars: formation
\item[08.06.3] Stars: fundamental parameters\newline
{\itshape (classification, colors, luminosities, masses, \newline
radii, temperatures, etc.)}
\item[08.07.1] Stars: general
\item[08.08.1] {\itshape (Stars:)} Hertzsprung--Russel (HR) diagram
\item[08.08.2] Stars: horizontal-branch
\item[08.09.1] Stars: imaging
\item[08.09.2] {\bf Stars: individual:} $\ldots$
\item[08.09.3] Stars: interiors
\item[08.11.1] Stars: kinematics
\item[08.12.1] Stars: late-type
\item[08.12.2] Stars: low-mass, brown dwarfs
\item[08.12.3] Stars: luminosity function, mass function
\item[08.13.1] Stars: magnetic fields
\item[08.13.2] Stars: mass-loss
\item[08.14.1] Stars: neutron
\item[08.14.2] {\itshape (Stars:)} novae, cataclysmic variables
\item[08.15.1] Stars: oscillations {\itshape (including pulsations)}
\item[08.16.1] Stars: peculiar {\itshape (except chemically peculiar)}
\item[08.16.2] {\itshape (Stars:)} planetary systems
\item[08.16.3] Stars: Population II
\item[08.16.5] Stars: pre-main sequence
\item[08.16.6] {\itshape (Stars:)} pulsars: general
\item[08.16.7] {\itshape (Stars:)} {\bf pulsars: individual:} $\ldots$
\item[08.18.1] Stars: rotation
\item[08.19.1] Stars: statistics
\item[08.19.2] {\itshape (Stars:)} subdwarfs
\item[08.19.3] {\itshape (Stars:)} supergiants
\item[08.19.4] {\itshape (Stars:)} supernovae: general
\item[08.19.5] {\itshape (Stars:)} {\bf supernovae: individual:} $\ldots$
\item[08.19.6] {\itshape (Stars:)} starspots
\item[08.22.1] {\itshape (Stars: variables:)} Cepheids
\item[08.22.2] {\itshape (Stars: variables:)} $\delta $ Scu
\item[08.22.3] Stars: variables: other
\item[08.23.1] {\itshape (Stars:)} white dwarfs
\item[08.23.2] Stars: Wolf-Rayet
\end{description}
\section*{Interstellar medium (ISM), nebulae}
\begin{description}[01.01.10]
\item[09.01.1] ISM: abundances
\item[09.01.2] ISM: atoms
\item[09.02.1] ISM: bubbles
\item[09.03.1] ISM: clouds
\item[09.03.2] {\itshape (ISM:)} cosmic rays
\item[09.04.1] {\itshape (ISM:)} dust, extinction
\item[09.07.1] ISM: general
\item[09.08.1] {\itshape (ISM:)} H\ts {\sc ii} regions
\item[09.09.1] {\bf ISM: individual objects:}
$\ldots$\newline {\itshape (except planetary nebulae)}
\item[09.10.1] ISM: jets and outflows
\item[09.11.1] ISM: kinematics and dynamics
\item[09.13.1] ISM: magnetic fields
\item[09.13.2] ISM: molecules
\item[09.16.1] {\itshape (ISM:)} planetary nebulae: general
\item[09.16.2] {\itshape (ISM:)} {\bf planetary nebulae: individual:}
$\ldots$
\item[09.18.1] {\itshape (ISM:)} reflection nebulae
\item[09.19.1] ISM: structure
\item[09.19.2] ISM: supernova remnants
\end{description}
\section*{The Galaxy}
\begin{description}[01.01.10]
\item[10.01.1] Galaxy: abundances
\item[10.03.1] Galaxy: center
\item[10.05.1] Galaxy: evolution
\item[10.06.1] Galaxy: formation
\item[10.06.2] Galaxy: fundamental parameters
\item[10.07.1] Galaxy: general
\item[10.07.2] {\itshape (Galaxy:)} globular clusters: general
\item[10.07.3] {\itshape (Galaxy:)} {\bf globular clusters: individual:}
$\ldots$
\item[10.08.1] Galaxy: halo
\item[10.11.1] Galaxy: kinematics and dynamics
\item[10.15.1] {\itshape (Galaxy:)} open clusters and associations: general
\item[10.15.2] {\itshape (Galaxy:)} {\bf open clusters and associations:
individual:} $\ldots$
\item[10.19.1] {\itshape (Galaxy:)} solar neighbourhood
\item[10.19.2] Galaxy: stellar content
\item[10.19.3] Galaxy: structure
\end{description}
\section*{Galaxies}
\begin{description}[01.01.10]
\item[11.01.1] Galaxies: abundances
\item[11.01.2] Galaxies: active
\item[11.02.1] {\itshape (Galaxies:)} BL Lacertae objects: general
\item[11.02.2] {\itshape (Galaxies:)} {\bf BL Lacertae objects: individual:}
$\ldots$
\item[11.03.1] Galaxies: clusters: general
\item[11.03.4] {\bf Galaxies: clusters: individual:} $\ldots$
\item[11.03.2] Galaxies: compact
\item[11.03.3] {\itshape (Galaxies:)} cooling flows
\item[11.04.1] Galaxies: distances and redshifts
\item[11.05.1] Galaxies: elliptical and lenticular, cD
\item[11.05.2] Galaxies: evolution
\item[11.06.1] Galaxies: formation
\item[11.06.2] Galaxies: fundamental parameters\newline
{\itshape (classification, colors, luminosities, masses,\newline radii,
etc.)}
\item[11.07.1] Galaxies: general
\item[11.08.1] Galaxies: halos
\item[11.09.1] {\bf Galaxies: individual:} $\ldots$
\item[11.09.2] Galaxies: interactions
\item[11.09.3] {\itshape (Galaxies:)} intergalactic medium
\item[11.09.4] Galaxies: ISM
\item[11.09.5] Galaxies: irregular
\item[11.10.1] Galaxies: jets
\item[11.11.1] Galaxies: kinematics and dynamics
\item[11.12.1] {\itshape (Galaxies:)} Local Group
\item[11.12.2] Galaxies: luminosity function, mass function
\item[11.13.1] {\itshape (Galaxies:)} Magellanic Clouds
\item[11.13.2] Galaxies: magnetic fields
\item[11.14.1] Galaxies: nuclei
\item[11.16.1] Galaxies: photometry
\item[11.16.2] Galaxies: peculiar
\item[11.17.1] {\itshape (Galaxies:)} quasars: absorption lines
\item[11.17.2] {\itshape (Galaxies:)} quasars: emission lines
\item[11.17.3] {\itshape (Galaxies:)} quasars: general
\item[11.17.4] {\itshape (Galaxies:)} {\bf quasars: individual:} $\ldots$
\item[11.19.1] Galaxies: Seyfert
\item[11.19.2] Galaxies: spiral
\item[11.19.3] Galaxies: starbust
\item[11.19.4] Galaxies: star clusters
\item[11.19.7] Galaxies: statistics
\item[11.19.5] Galaxies: stellar content
\item[11.19.6] Galaxies: structure
\end{description}
\section*{Cosmology}
\begin{description}[01.01.10]
\item[12.03.1] {\itshape (Cosmology:)} cosmic microwave background
\item[12.03.2] Cosmology: miscellaneous
\item[12.03.3] Cosmology: observations
\item[12.03.4] Cosmology: theory
\item[12.04.1] {\itshape (Cosmology:)} dark matter
\item[12.04.2] {\itshape (Cosmology:)} diffuse radiation
\item[12.04.3] {\itshape (Cosmology:)} distance scale
\item[12.05.1] {\itshape (Cosmology:)} early Universe
\item[12.07.1] {\itshape (Cosmology:)} gravitational lensing
\item[12.12.1] {\itshape (Cosmology:)} large-scale structure of Universe
\end{description}
\section*{Sources as a function of wavelength}
\begin{description}[01.01.10]
\item[13.07.1] Gamma rays: bursts
\item[13.07.2] Gamma rays: observations
\item[13.07.3] Gamma rays: theory
\item[13.09.1] Infrared: galaxies
\item[13.09.2] Infrared: general
\item[13.09.3] Infrared: ISM: continuum
\item[13.09.4] Infrared: ISM: lines and bands
\item[13.09.5] Infrared: solar system
\item[13.09.6] Infrared: stars
\item[13.18.1] Radio continuum: galaxies
\item[13.18.2] Radio continuum: general
\item[13.18.3] Radio continuum: ISM
\item[13.18.4] Radio continuum: solar system
\item[13.18.5] Radio continuum: stars
\item[13.19.1] Radio lines: galaxies
\item[13.19.2] Radio lines: general
\item[13.19.3] Radio lines: ISM
\item[13.19.4] Radio lines: solar system
\item[13.19.5] Radio lines: stars
\item[13.21.1] Ultraviolet: galaxies
\item[13.21.2] Ultraviolet: general
\item[13.21.3] Ultraviolet: ISM
\item[13.21.4] Ultraviolet: solar system
\item[13.21.5] Ultraviolet: stars
\item[13.25.1] X-rays: bursts
\item[13.25.2] X-rays: galaxies
\item[13.25.3] X-rays: general
\item[13.25.4] X-rays: ISM
\item[13.25.5] X-rays: stars
\end{description}
\end{document}