Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..128s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 1, 1988, p. 128-138.
Astronomy and Astrophysics
Astrophysics
32
Metallic Stars, O Stars, Stellar Evolution, Stellar Mass, Stellar Mass Ejection, Wolf-Rayet Stars, Andromeda Galaxy, Emission Spectra, Late Stars, Line Spectra, Magellanic Clouds, Stellar Atmospheres
Scientific paper
The population of W-R stars in local group galaxies are compared on the basis of quantities expected to be little affectrd by incompleteness of the surveys. The ratio of the number of strong line W-R stars to the number of OB stars with M(V) less than -4.5 is found to range from less than 1/1000 to more than 1/10 and correlates with metallicity. The low-metallicity galaxies have lower numbers of W-R stars, and all of these may be binaries. The ratio between number of stars in the two sequences WC/WNE (single) also correlates with metallicity. The presence of later subclasses of WC stars is strongly correlated with metallicity; WC 7-9 stars occur only in the inner part of M33 and in the metal-rich galaxies MWG and M31.
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