Initial mass function in the South-Western part of M 31

Details Initial mass function in the South-Western part of M 31 Initial mass function in the South-Western part of M 31

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...426..495v&link_type=abstract

Astronomy and Astrophysics, v.426, p.495-501 (2004)

Astronomy and Astrophysics

Astrophysics

3

Galaxies: Individual: M 31, Galaxies: Stellar Content, Galaxies: Ism, Stars: Luminosity Function, Mass Function, Stars: Early-Type, Stars: Supergiants

Scientific paper

We derive an average initial mass function (IMF) for 50 OB associations in the South-Western part of Andromeda galaxy, combining ultraviolet photometry of Hill et al. (\cite{Hill95}, ApJ, 98, 595) and two datasets HST photometry with JHKs photometry from the 2MASS + I band photometry from Magnier et al. (\cite{Magnier92}, A&A, 96, 379). The mean extinctions within the associations were estimated in two independent ways and the stellar masses were determined by use of probabilistic techniques. The derived slope of the IMF Γ=-1.59 ± 0.09 is close to the universal Salpeter's law and to recent estimates for massive stars' IMF in the Galaxy and in the Magellanic Clouds.

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