Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..903b&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 903-912.
Astronomy and Astrophysics
Astronomy
31
Hydrogen, Luminosity, Neutral Gases, Radio Sources (Astronomy), Spiral Galaxies, Disk Galaxies, Galactic Clusters, Interstellar Matter, Stellar Evolution, Stellar Mass, Ultraviolet Photometry, Virgo Galactic Cluster
Scientific paper
Optical and 21 cm H I data have been compiled for 70 galaxies classified according to the revised DDO classification system. The sample comprises 12 anemics (of which 11 are classified Ab), 26 Sb, and 32 Sc galaxies. A comparison of the colors, luminosities, and H I contents of anemic galaxies (mostly Ab) versus 'normal' spirals reveals that anemics on average have at least a factor 4 lower value of M(H)/L, but similar colors and luminosities to the normal spirals. Since the phenomenon of anemia is not exclusively restricted to clusters, it is suggested that it can occur when star formation processes operating in a disk change their character as a result of some internal change, as opposed to a removal of gas by an external stimulus such as that provided by a cluster environment.
Bothun Gragory D.
Sullivan Woodruff T. III
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