The populations of massive stars in the Galaxy - Their frequency gradients in relation to metallicity and initial mass function

Details The populations of massive stars in the Galaxy - Their frequency gradients in relation to metallicity and initial mass function The populations of massive stars in the Galaxy - Their frequency gradients in relation to metallicity and initial mass function

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124...84m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 84-88.

Astronomy and Astrophysics

Astrophysics

39

O Stars, Star Distribution, Stellar Evolution, Supergiant Stars, Wolf-Rayet Stars, Density (Number/Volume), Metallicity, Milky Way Galaxy

Scientific paper

The star densities per unit surface in the galactic plane of 0-stars, blue, yellow, red supergiants and WR stars are established within a distance of 2.5 kpc from the sun, where complete and statistically meaningful samples can be obtained. A new and complete sample of supergiants has been collected and analysed.
The variations of star density as a function of the galactocentric distance are about the same for 0-stars, blue and yellow supergiants: their density is higher towards the galactic center (by a factor of 2 over an interval of 4 kpc). The density gradient of WR stars in the Galaxy is of the same sign, but much steeper than for 0-stars (by a factor of about 4). The red supergiants show a gradient of the opposite sign in their galactic distribution.
It is emphasized that the distribution of WR stars and red supergiants in the Galaxy is not only the reflect of the gradient of the initial mass function; the differences with the distribution of 0-stars are attributed to the gradient of chemical composition in the Galaxy, probably through mass loss effects.
It is also noted that the observed number of stars (supergiants, WR stars) out of the formal main sequence appears larger than given by stellar models. This should be accounted for in IMF determinations.

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