Distribution and luminosity function of OB stars in M 31

Details Distribution and luminosity function of OB stars in M 31 Distribution and luminosity function of OB stars in M 31

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214...68b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 68-78.

Astronomy and Astrophysics

Astrophysics

23

Andromeda Galaxy, B Stars, O Stars, Star Distribution, Stellar Luminosity, Astronomical Catalogs, Main Sequence Stars, Stellar Evolution, Supergiant Stars, Ubv Spectra

Scientific paper

The catalog of bright stars in the field of M 31 (Berkhuijsen et al., 1988) was used to investigate the distribution and luminosity function of upper main-sequence stars and supergiants in M 31. More than 700 blue stars brighter than V = 20 mag were detected, of which about 300 are probable O stars. The eastern spiral arms contain about 30 percent more O stars than the western arms. The slope of the luminosity function depends on the color criterion used to select the stars in the sample. The conclusion of Freedman (1985) that the slope of the luminosity function of upper main-sequence stars does not significantly vary between galaxies is confirmed. The luminosity function for supergiants, however, is considerably flatter than that for O stars, possibly because the corresponding main-sequence stars are missing from this sample.

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