The Astrophysical Journal, Volume 48
University of Chicago Press, 1918 - Astrophysics
"Letters to the Editor" issued as Part 2 and separately paged from v. 148, 1967. Beginning in 2009, the Letters published only online.
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absolute magnitude absorption apparent magnitude appear Astronomical Astronomische Astrophysical Journal atom average band barium brighter brightest brightness cent Cepheid variables cluster-type variables color column of Table computed corresponding Cygni derived determined diameter distance electrons elements energy equation faint fainter furnace galactic plane giant stars given in Table globular clusters groups haze hazy hydrogen hydrogen lines indicated intensity investigation July km per sec km/sec Lick Observatory light-curve luminosity mass maximum measures median magnitude Messier method of direct Mount Wilson nebula number of lines number of stars observations Observatory Bulletin obtained orbits paper parallaxes parsecs period photo-visual photometer plates present probable error proper motion radial velocities radiation reduced region relative Shapley slit solar spectral type spectroscopic spectrum stellar tion ture variable stars variation visibility-curve visual magnitude wave-lengths Wilson Contr zero-point