Massive star population in M 31 OB associations

Details Massive star population in M 31 OB associations Massive star population in M 31 OB associations

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259...17c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 17-24.

Astronomy and Astrophysics

Astrophysics

7

Andromeda Galaxy, B Stars, Massive Stars, O Stars, Star Formation, Hertzsprung-Russell Diagram, Star Distribution, Wolf-Rayet Stars

Scientific paper

From data taken at the 3.60 m CFHT in the U, B, V and I bands and in interference filters centered on the HeII, CIII lines and at 4749 A (continuum), we perform stellar photometry on several OB associations in the Andromeda galaxy, using DAOPHOT. This allows us to build H-R diagrams from which we deduce for V magnitudes between 16 and 22, the slope of the differential Luminosity Function (LF) and derive from it an Initial Mass Function (IMF). We used the HeII, CIII, and 'continuum' narrow bands to detect the Wolf-Rayet candidates by an 'ON LINE-OFF LINE' method. In the absence of confirmation spectra, we retain only 3 probable ones, plus 5 recently confirmed in two of our common fields by Armandroff and Massey and 2 already found by Moffat and Shara (1987), to obtain an estimation of the ratio WR/O.

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