Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..777g&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 777-790. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
342
Astronomical Catalogs, Milky Way Galaxy, O Stars, Star Distribution, Stellar Mass, Supermassive Stars, Wolf-Rayet Stars, Hertzsprung-Russell Diagram, Mass To Light Ratios, Stellar Evolution, Stellar Luminosity, Stellar Spectra, Ubv Spectra
Scientific paper
A machine readable catalog of over 750 galactic O stars with published photometry, spectral types, and luminosity classes has been compiled. The catalog is probably complete to a distance of about 2.5 kpc. From this volume-limited data, the initial mass function (IMF) for stars more massive than 20 solar masses has been derived. This IMF differs from that of Miller and Scalo (1979) and of Lequeux (1979), in having proportionately more O type stars and not as steep a fall-off in number of stars with increasing mass. Dividing the sample into stars inside and outside the solar circle, a substantial difference in the IMF of the most massive stars is found. There are proportionally more toward the galactic center. This gradient in the IMF may be related to the observed space density of Wolf-Rayet stars, which are descendants of O type stars.
Chiosi Cesare
Conti Peter S.
Garmany Catharine D.
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