Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-06-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
19 pages, 4 figures, 4 tables
Scientific paper
WY Per and RW Leo are two Algol-type binaries. Based on our new CCD observations and the almost century-long historical record of the times of primary eclipse for WY Per and RW Leo, the orbital period changes and their explanations were reanalyzed and rediscussed in detail. It is found that the orbital period of WY Per shows a cyclic oscillation with a period of $P_{3} = 71.5$ yr and a semiamplitude of $A_{3} = 0^{\textrm{d}}.0739$. The period variation can be interpreted by the light-travel time effect (LTTE) via the presence of a third body in an eccentric orbit with an eccentricity of $e_{3} \simeq 0.602$ in the system. For RW Leo, its orbital period shows complex variations. Two cyclic variations (i.e., $P_{3} = 77.8$ yr and $A_{3} = 0^{\textrm{d}}.033$, and $P_{4} = 39.1$ yr and $A_{4} = 0^{\textrm{d}}.022$) are discovered. The cyclic variation of $P_{3} = 77.8$ yr and $A_{3} = 0^{\textrm{d}}.033$ can be attributed to the LTTE via the presence of a third body in an eccentric orbit with an eccentricity of $e_{3} \simeq 0.732$.
Sheng-Bang Qian
Wen-Ping Liao
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