Period changes and photometric solution of AP Leonis

Details Period changes and photometric solution of AP Leonis Period changes and photometric solution of AP Leonis

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cha%26a..16..407z&link_type=abstract

Chinese Astronomy and Astrophysics (ISSN 0275-1062) Translation., vol. 16, no. 4, p. 407-415.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Starspots, Stellar Temperature, Variable Stars, Photosphere, Stellar Atmospheres, Stellar Spectra

Scientific paper

The results of BV photometry of AP Leonis are presented. Photometric analysis is carried out by using the Wilson-Devinney program. The solution shows that the system is an over-contact binary with an over-contact degree of 23.5 percent and its mass ratio q equal to 0.301. A starspot group is found in the low latitude region on the secondary component. The average temperature of the spot is about 1220 K lower than that of surrounding photosphere. The light minimum times observed over ninety years are collected. The O-C curve of minima reveals that the period of AP Leo changes with the time in a pseudosinusoidal pattern and there is probably a third body in the system.

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