Evolved contact systems of spectral type O. I - UW Canis Majoris

Details Evolved contact systems of spectral type O. I - UW Canis Majoris Evolved contact systems of spectral type O. I - UW Canis Majoris

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..924l&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 15, 1978, p. 924-930. Research supported by the University of Nebraska.

Astronomy and Astrophysics

Astrophysics

32

Early Stars, Eclipsing Binary Stars, Light Curve, O Stars, Stellar Evolution, Luminous Intensity, Mass Ratios, Radial Velocity, Stellar Spectrophotometry

Scientific paper

The light curves of UW CMa by Seyfert (1941) and by Ogata and Hukusaku (1977) were analyzed using the Wilson and Devinney (1971) approach. The system is found to be an evolved contact system. The unusual variations in the light curves may be caused by a highly nonuniform surface brightness of the common envelope. The photometric solution favors a secondary/primary mass ratio less than unity. The asymmetry in the radial-velocity curves is not due to an eccentricity in the orbit but is caused by complicated effects arising from the closeness of the components. It is suggested that UW CMa has components of 46 and 34 solar masses, making it one of the most massive contact systems known so far.

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