| 中等质量富金属AGB长周期变星的振动研究 |
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| 引用本文： | 龚志刚,李焱,黄润乾.中等质量富金属AGB长周期变星的振动研究[J].中国天文和天体物理学报,1995(1). |
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| 作者姓名： | 龚志刚 李焱 黄润乾 |
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| 作者单位： | 中国科学院云南天文台 |
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| 摘 要： | 本文采用恒星演化计算与恒星振动计算相结合的方法，对中等质量富金属恒星演化到渐近巨星分支时的振动性质进行了分析研究，从理论上得出这类恒星的振动方式是处于一阶谐频振动，而振动的激发则是在氢电离区和氦的二次电离区由多种机制共同作用造成的，同时提出很长周期的ＡＧＢ长周期变星只能是由中等质量恒星演化到ＡＧＢ阶段形成的。我们的理论计算结果还比较支持在ＡＧＢ顶端存在巨大星风物质损失的观点，且这种星风物质损失很可能与恒星振动有关。
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| 关 键 词： | 恒星振动，AGB长周期变星，恒星演化，质量损失 |
Pulsations of Intermediate-Mass Metal-Rich AGB Long Period Variables |
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| GONG Zhi-gang, LI Yan,HUANG Run-qian.Pulsations of Intermediate-Mass Metal-Rich AGB Long Period Variables[J].Chinese Journal of Astronomy and Astrophysics,1995(1). |
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| Authors: | GONG Zhi-gang LI Yan HUANG Run-qian |
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| Abstract: | A study of the pulsations of the intermediate-mass metal-rich stars on the asymptotic giant branch were carried out by computing both their evolution and oscillations.Based on the numerical results of the first three linear nonadiabatic radial pulsation modes,the first overtone was the most possible pulsation mode for AGB long period variables (LPVs).The pulsations were excited at H and He ionization zone by the interaction of gas and radiation field. Very long period AGB LPVs can only be evolved by the intermediate mass stars.A great mass loss rate,which may relate to pulsation,is needed at the top AGB phase. |
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| Keywords: | stellar oscillation AGB LPVs stellar evolution mass loss |
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