The Unified Astronomy Thesaurus

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Metallicity original
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Chemical abundances original
Observational astronomy original
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Astronomical instrumentation original
Astronomical methods original
Astronomical research original
Astronomical techniques original
Telescopes original
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Astronomical instrumentation original
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Automated telescopes original
Gamma-ray telescopes original
Grazing incidence telescopes original
Ground telescopes original
Meridian circles original
Neutrino telescopes original
Optical telescopes original
Radio telescopes original
Solar telescopes original
Space telescopes original
Telescope mounts original
Wide-field telescopes original
Late-type supergiant stars original
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Late-type stars original
Supergiant stars original
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K supergiant stars original
M supergiant stars original
Red supergiant stars original
SRd variable stars original
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Semi-regular variable stars original
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UU Herculis stars original
Beta Lyrae stars original
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Eclipsing binary stars original
Ellipsoidal variable stars original
Subdwarf stars original
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Stellar evolutionary types original
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A subdwarf stars original
B subdwarf stars original
F subdwarf stars original
G subdwarf stars original
O subdwarf stars original
T subdwarfs original
Color equation original
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Photometric systems original
A dwarf stars original
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A stars original
Dwarf stars original
DQ Herculis stars original
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Novae original
definition "A type of cataclysmic variable binary star system with a white dwarf and a cool main-sequence secondary star." - Wikipedia