The Equations of Ellipsoidal Star Variability Applied to HR 8427

Details The Equations of Ellipsoidal Star Variability Applied to HR 8427 The Equations of Ellipsoidal Star Variability Applied to HR 8427

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..344m&link_type=abstract

Astrophysical Journal v.419, p.344

Astronomy and Astrophysics

Astronomy

14

Stars: Binaries: Spectroscopic, Stars: Individual Bright Star Number: Hr 8427

Scientific paper

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°.

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