Spectrophotometric methods for determining stellar luminosity

absolute magnitude absorption absorption spectrum Andromedae Aon Aon appear Astrophysical Journal atmosphere average band binaries Boss bright lines brighter central stars color excess column components computed continuous spectrum correction corresponding curve Cygni density derived determined difference diffuse nebulae distance distribution ellipsoidal emission nebulae emission spectra enhanced lines equation exposure faint fainter furnace galactic latitude galactic nebulae galvanometer giant stars give given hydrogen lines images indicate intensity ionization km/sec Lick Observatory luminosity mean measured method Mount Wilson nebulosity number of stars objects observations obtained Orion oxygen parsecs photo-visual photographic magnitudes plane planetaries plates points probable error proper motion radial velocities radiation reflector region relative Rigel scale slit solar spectral type spectrograms spectroscopic spiral stars involved stellar surface Table Taurus Taurus Taurus Temp temperature thermocouple tion trigonometric parallaxes values variables Venus water vapor wave-lengths Wilson Contr