| On the Period Variation of the W UMa-type Contact Binary V502 Ophiuchi |
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| 引用本文： | Qing-Yao Liu and Yu-Lan Yang National Astronomical Observatories/Yunnan Observatory,Chinese Academy of Sciences,Kunming 650011,. On the Period Variation of the W UMa-type Contact Binary V502 Ophiuchi[J]. 中国天文和天体物理学报, 2006, 6(3): 331-337 |
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| 作者姓名： | Qing-Yao Liu and Yu-Lan Yang National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 |
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| 作者单位： | Qing-Yao Liu and Yu-Lan Yang National Astronomical Observatories/Yunnan Observatory，Chinese Academy of Sciences，Kunming 650011; |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家重点基础研究发展计划(973计划) |
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| 摘 要： | The variation in the orbital period of the W UMa type contact binary V502 Oph is analyzed. The orbital period exhibits a wavelike variation with a periodicity of 23.0 years and an amplitude of △P = 1.24×10~(-6) days superimposed on secular decrease of dP/dt = 1.68×10-7 day per year. The long-term decrease may be accompanied by the contraction of the secondary at a rate of 83 m per year and a mass transfer rate from the primary to the secondary of 4.28×10~8 M per year. The short-term oscillation may be explained by the presence of a third component. Orbital elements of the third body and its possible mass are presented.
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| 关 键 词： | 恒星物理学 光谱类型 天文现象 视向速度 |
On the Period Variation of the W UMa-type Contact Binary V502 Ophiuchi |
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| Qing-Yao Liu,Yu-Lan Yang. On the Period Variation of the W UMa-type Contact Binary V502 Ophiuchi[J]. Chinese Journal of Astronomy and Astrophysics, 2006, 6(3): 331-337 |
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| Authors: | Qing-Yao Liu Yu-Lan Yang |
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| Affiliation: | National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 |
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| Abstract: | |
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| Keywords: | stars: contact binary - period change - star: individual: V502 Oph |
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