AQ Cassiopeiae: New five-color observations and photometric solutions, including corrections for stream emission

Details AQ Cassiopeiae: New five-color observations and photometric solutions, including corrections for stream emission AQ Cassiopeiae: New five-color observations and photometric solutions, including corrections for stream emission

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..666o&link_type=abstract

The Astronomical Journal, vol. 108, no. 2, p. 666-670

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Radial Velocity, Stellar Luminosity, Ultraviolet Photometry

Scientific paper

Complete five-color light curves are presented of the massive eclipsing binary AQ Cassiopeiae. Stream extinction depresses light levels just before primary eclipse, complicating photometric solutions. A photometric solution excluding stream-depressed observations is described. A stream capable of absorbing a detectable amount of light, moreover, also contributes extra light around first quadrature, when the stream is viewed against the sky. This excess light, is estimated using the stream model of Olson & Bell, is removed from affected observations, and a new and improved photometric solution is obtained. The radial velocity curve of the loser is extracted from spectroscopic observations of the O I lambda7774 line, and absolute system parameters are estimated. The gainer is a rapid rotator, but this rotation has little effect on the photometric solutions of this totally eclipsing binary. AQ Cas is not a double-contact system in which the hot gainer fills its limiting rotational lobe.

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