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THE LABORATORY BASIS OF ASTROPHYSICS
THE STELLAR TEMPERATURE SCALE
PRESSURES IN STELLAR ATMOSPHERES
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absolute magnitude absorbing absorption lines abundance appear astrophysical background Balmer band calcium changes Chapter classification columns constant contains continuous cooler corresponding depth derived determined direct discussed Draper dwarf effect electron elements emission energy estimates evidence excitation fact Fo-Ma Fowler fraction giant give given hydrogen important increase indicate intensity ionization potential ionized atoms known laboratory lower marginal material maximum mean measured metallic method Milne multiplets neutral neutral atoms normal observed obtained occur orbits original photosphere Phys physical possible predicted present pressure probably problem Proc produced quantity question relations relative represented reversing layer rise Russell scale seen sequence silicon solar spectrum spectral class stars stellar atmosphere stellar spectra strength strong strontium suggested surface temperature theory thermal tion ultimate lines wave-length