| 小质量密近双星Case A演化和几乎相接双星的形成 |
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| 引用本文： | 张孝斌,翟迪生,黄润乾.小质量密近双星Case A演化和几乎相接双星的形成[J].中国天文和天体物理学报,1993(2). |
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| 作者姓名： | 张孝斌 翟迪生 黄润乾 |
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| 作者单位： | 中国科学院北京天文台，中国科学院北京天文台，中国科学院云南天文台 北京 100080，北京 100080 |
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| 摘 要： | 计算了总质量为3.9M,具有不同初始质比和两子星间距的一组模型在总质量、总角动量守恒假设下的Case A演化,以探求Case A演化与几乎相接双星(NCS)可能的联系.结果表明确实存在经过Case A质量交流演化为NCS系统的途径。并且这样形成的NCS系统其随后的演化有两种前景:一种随即演化为相接系统;另一种则经由慢速质量交流成为较稳定的半接或不接系统.但能够演化为NCS状态的初始模型范围极为狭窄,本文大致确定了它们的初始质比、子星间距等参量范围. 结合模型计算结果,对已知29个NCS系统作了统计研究,结果表明NCS系统与相接双星在演化上有很密切的联系.
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| 关 键 词： | 恒星 密近双星CaseA 几乎相接双星 |
A Study of Case A Evolution into Near Contact Binary Systems |
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| ZHANG Xiao-bin ZHAI Di-sheng.A Study of Case A Evolution into Near Contact Binary Systems[J].Chinese Journal of Astronomy and Astrophysics,1993(2). |
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| Authors: | ZHANG Xiao-bin ZHAI Di-sheng |
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| Abstract: | The computation of case A evolution was carried out for a low mass binary system of 3.9 solar masses. A total of 15 models with different initial mass ratios and separations were calculated under conversation assumption. It was revealed that the NCS system can be formed by Case A mass transfer without contact phase ,but the range of the initial models is limited. Compared with the computations, a statistical study of 29 known NCS systems was made. Two future evolution traces were shown for NCS systems: one will evolve into contact; and the other will get in detached and or semi-detached state. |
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| Keywords: | Close binaries-Case A-near contact systems |
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