The Equations of Ellipsoidal Star Variability Applied to HR 8427
Abstract
The light curves of ellipsoidal variables lack some of the complexities of eclipsing binary light curves, and the equation that describes their theoretical variations is given as a discrete Fourier series. Explicit equations are also found for variations due to the reflection effect.
These results are then used to determine the orbital elements of the ellipsoidal variable HR 8427 (= V365 Lac). It is found that this is a hot reverse Algol system with an unevolved B4 V secondary star, and not a black hole as had been previously suggested. The system has a mass ratio of 0.63 and an orbital inclination of 52°.- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1993
- DOI:
- 10.1086/173488
- Bibcode:
- 1993ApJ...419..344M
- Keywords:
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- STARS: BINARIES: SPECTROSCOPIC;
- STARS: INDIVIDUAL BRIGHT STAR NUMBER: HR 8427