Photometric study and period analysis of the contact binary XZ Leonis
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
We present multi-color CCD photometry of the neglected contact binary XZ Leo. Completely covered VRI band light curves and four times of minimum light were obtained. Combining the photometric and previously published radial-velocity data, a revised photometric analysis was carried out for the binary system by applying the Wilson–Devinney code. With a hot spot placed on the massive primary component near the neck region of the common envelope, the light curves were satisfactorily modeled. The photometric solution combined with the radial-velocity solution reveals that XZ Leo is an A-type contact binary with a degree of contact of 24(±1)%. The absolute parameters of the components were determined to be M{sub 1} = 1.74(±0.06)M{sub ⊙}, M{sub 2} = 0.61(±0.02)M{sub ⊙}, R{sub 1} = 1.69(±0.01)R{sub ⊙}, R{sub 2} = 1.07(±0.01)R{sub ⊙}, L{sub 1} = 6.73(±0.08) L{sub ⊙}, and L{sub 2} = 2.40(±0.04)L{sub ⊙}. Based on all the available data, the long-term orbital period behavior of the system was investigated. It indicates that the binary system was undergoing a continuous orbital period increase in the past three decades with a rate of dP/dt =+6.12×10{sup −8} days yr{sup −1}, which suggests a probable mass transfer from the secondary to the primary component at a rate of dM/dt=3.92×10{sup −8}M{sub ⊙} yr{sup −1}. The binary system is expected to evolve into the broken-contact stage in 1.56×10{sup 6} years. This could be evidence supporting the thermal relaxation oscillation theory.
- OSTI ID:
- 22890202
- Journal Information:
- The Astronomical Journal (Online), Vol. 150, Issue 3; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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