Mathematics – Logic
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..587c&link_type=abstract
Astrophysical Journal, vol. 203, Feb. 1, 1976, pt. 1, p. 587-592.
Mathematics
Logic
31
Astronomical Spectroscopy, Galactic Radiation, H Alpha Line, Spiral Galaxies, Ubv Spectra, Astronomical Photometry, B Stars, Cool Stars, H Beta Line, H Ii Regions, Hot Stars, O Stars, Radiant Flux Density, Stellar Luminosity
Scientific paper
Results are reported for observations of the amount of H-alpha emission from the disks of 53 galaxies with mean major diameters less than 3 arcmin. A correlation between B-V color and H-alpha emission is found whereby bluer galaxies of a given morphological type have greater emission in H-alpha. It is shown that the H-alpha emission originates from discrete ordinary H II regions ionized by starlight and that the amount of emission depends on the proportion of hot to cool stars, rather than on the availability of gas. The number of H II regions required to produce the observed emission is compared with the number of H II regions in galaxies of various morphological types measured directly from photographs taken with H-alpha interference filters. The ratio of hot stars to cool ones corresponding to the observed range in B-V color is determined and found to agree well with a theoretical model that predicts B-V color as a function of stellar luminosity in a galaxy.
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