Photometric Observations of O-Type Binary Systems with the Four College Automated Photometric Telescope

Details Photometric Observations of O-Type Binary Systems with the Four College Automated Photometric Telescope Photometric Observations of O-Type Binary Systems with the Four College Automated Photometric Telescope

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7702g&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #77.02; Bulletin of the American Astronomical Society, Vol. 31, p.1486

Astronomy and Astrophysics

Astronomy

Scientific paper

The fundamental parameters of O-type stars are important tests of the theoretical predictions of massive stars. The most direct observational means of determining these parameters is through the study of binaries. In order for the mass of the component stars in a double-lined spectroscopic binary to be determined, some estimate of the inclination must be found. This emphasizes the importance of double-lined systems that also show light variations due to their orbital inclination (eclipses, ellipsoidal variations). We have recently embarked upon a project to photometrically observe well-known O-type binaries using the Four College Automated Photometric Telescope (FCAPT). The relatively recent discoveries of eclipses (and ellipsoidal variations) of two such systems (HD 152248:Mayer, Lorentz, & Drechsel 1992 and HD 135240:Penny, Seyle, Gies & Bagnuolo 2000) has spurred these observations. We present our initial target list and some preliminary observations and analysis.

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