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ON THE DEVELOPMENT OF Asē RoPHYSICs DURING THE LAST
CLAssIFICATION of STELLAR SPECTRA
INTERPRETATION OF NorMAL STELLAR SPECTRA
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absorption coefficient absorption lines abundances assumed asteroids astrophysical Balmer bands bright broadening cepheids chromosphere cometary comets components computed condensation considered continuous absorption continuous spectrum corresponding curve of growth derived determined disk distance distribution Doppler eclipsing eddies effective temperature ejection electron elements emission lines energy equation equilibrium excitation function galactic gaseous gravitational helium hydrogen lines intensity interstellar investigations ionization km/sec layers light curve long-period luminosity magnitude mass maximum measured method molecular molecules motion novae nucleus number of atoms Observatory observed obtained optical depth orbit parallax particles period photosphere planetary planets pressure problem protoplanets radiation radius ratio region relative ring Roche density rotation satellites scattering Schwarzschild solar atmosphere solar nebula spectral class spectral lines spectral type spectroscopic binaries stellar atmospheres stellar spectra sunspot supergiants surface tail theoretical theory tion variable variation visual wavelength widths