Variable Stars & Galactic Structure

A. H. Joy abscissa absolute magnitudes absorption apparent magnitude apparent modulus astr Astrophys Baade CALIFORNIA LIBRARY Cepheid variables classical Cepheids classical novae colour excesses difference Distribution of periods E. P. Hubble fainter Figure frequency galactic centre galactic Cepheids galactic clusters galactic latitude galactic longitude galactic plane galactic structure Gaposchkin globular clusters gradient group of stars high-velocity intrinsic variables kiloparsecs light curves lines of hydrogen logarithm of period long-period variables luminosity maximum Mean Messier 31 motions numbers of stars obscuration orbits parsecs period-luminosity curve photographic magnitude Population II stars Publ radial velocity recurrent novae Red semiregular relation rotation RR Lyrae stars RV Tauri stars semiregular red variables semiregular variables Shapley short-period shows Small Cloud Small Magellanic Cloud spectra spectral class Spectrum stars in globular Stars of Population stellar Supernovae SX Herculis Table tion tudes UNIVERSITY OF CALIFORNIA variable stars velocity curve Virginis stars