| A Possible Explanation of the O‘Connell Effect in Close Binary Stars |
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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
United Laboratory of Optical Astronomy Chinese Academy of Sciences |
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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
United Laboratory of Optical Astronomy，Chinese Academy of Sciences |
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| 基金项目： | SuppoSed by the National Natural Science Foundation of China. |
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| 摘 要： | A theoretical model for explaining the O‘Connell effect of close binary stars is given based on the hypothesis that the circumstellar material of a binary system is captured by its components.The results inferred form the model suggest that late-type and /or short-period binaries can easily produce obvious O‘Connell effect and that the occurrence of O‘Connell effect has no relation with the type of binaries,These conclusions are in agreement with the observed results.The observed O‘Connell effects of six binary systems are examined by the model.For three W-subtype W UMa binaries(YY Eri,BX Per and SW Lac).the densities of the materials captured by the two components are assumed to be equal,and the calculated O‘Connell effect is found to be almost equal to the observed effect.For three A-subtype W UMa systems(CN And,FG Hya and AU Ser),the two densities are assumed to be different,and are calculated separately.The calculated O‘Connell effect turns out to agree better with the observed effect than that was formerly obtained.
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| 关 键 词： | 封闭二元星素 光学观测 拱星物质 二元体系 理论模型 |
A Possible Explanation of the O'Connell Effect in Close Binary Stars |
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| Qing-Yao Liu and Yu-Lan Yang
National Astronomical Observatories,Yunnan Observatory,Chinese Academy of Sciences,Kunming
United Laboratory of Optical Astronomy,Chinese Academy of Sciences.A Possible Explanation of the O''''Connell Effect in Close Binary Stars[J].Chinese Journal of Astronomy and Astrophysics,2003,3(2):142-150. |
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| Authors: | Qing-Yao Liu Yu-Lan Yang |
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| Institution: | [1]NationalAstronomicalObservatories,YunnanObservatory,ChineseAcademyofSciences,Kunming650011,Bily [2]UnitedLaboratoryofOpticalAstronomy,ChineseAcademyofSciences |
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| Abstract: | A theoretical model for explaining the O'Connell effect of close binary stars is given based on the hypothesis that the circumstellar material of a binary system is captured by its components. The results inferred from the model suggest that late-type and/or short-period binaries can easily produce obvious O'Connell effect and that the occurrence of O'Connell effect has no relation with the type of binaries. These conclusions are in agreement with the observed results. The observed O'Connell effects of six binary systems are examined by the model. For three W-subtype W UMa binaries (YY Eri, BX Per and SW Lac), the densities of the materials captured by the two components are assumed to be equal, and the calculated O'Connell effect is found to be almost equal to the observed effect. For three A-subtype W UMa systems (CN And, FG Hya and AU Ser), the two densities are assumed to be different, and are calculated separately. The calculated O'Connell effect turns out to agree better with the observed effect than that was formerly obtained. |
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| Keywords: | binaries: close - star: W UMa - circumstellar matter |
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