Spectrophotometric Methods for Determining Stellar Luminosity

absolute magnitude absorption absorption spectrum Andromedae Aon Aon 0.9 Astrophysical Journal atmosphere average band Boss brighter central stars color color-index column components computed constant continuous spectrum correction corresponding curve Cygni density derived determined diffuse nebulae distance ellipsoids emission nebulae emission spectra enhanced lines equation exposure faint fainter furnace galactic latitude galactic nebulae giant giant stars give given Hẞ hydrogen lines images intensity ionization km/sec Lick Observatory luminosity mean measured Milky MOUNT WILSON OBSERVATORY nebulosity number of stars objects observations obtained Orion oxygen parsecs photographic magnitudes plane planetaries plates points pole probable error proper motion radial velocities radiation region relative scale slit solar spectral type spectrograms spectroscopic spiral stellar surface systematic errors Table Taurus temperature thermocouple tion Ursae values variable Venus wave-lengths Wilson Contr ΙΟ Ο.ΟΙΟ