Massive Star Evolution and SN 1987A
Massive Star Evolution and SN 1987A
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大规模恒星演化和 SN 1987A
DOI：
10.1086/170786
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
D. Arnett
中科院分区：
文献类型：
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作者：
D. Arnett
大质量恒星通过氢和氦燃烧的演化是解决。一组恒星的演化序列的质量/太阳质量为15，20和25，金属丰度为0.002，0.005，0.007，0.010和0.20;对流被限制为操作慢于当地的热时标。利用这些序列，我们发现大麦哲伦星云大质量星星含量的简单模型与菲茨帕特里克和加玛尼（1990）的新观测数据相当吻合。LMC超巨星只在它们的主序后阶段被发现，所以那里有5-10倍的质量恒星，但没有被识别出来。有人认为，SN 1987 A展示了一个正常的演化星星约20个太阳质量具有LMC丰度。尽管包层的行为各不相同，但对于给定质量的恒星来说，坍缩时的核心结构是相当相似的。由于不同的质量损失率的变化可能比那些由于组成更大。
The evolution of massive stars through hydrogen and helium burning is addressed. A set of stellar evolutionary sequences for mass/solar mass of 15, 20, and 25, and metallicity of 0.002, 0.005, 0.007, 0.010, and 0.20 are presented; semiconvection is restricted to operating slower than the local thermal time scale. Using these sequences, simple models of the massive star content of the LMC are found to agree moderately well with the new observational data of Fitzpatrick and Garmany (1990). LMC supergiants were detected only in their postmain-sequence phases, so that 5-10 times more massive stars are there but not identified as such. It is argued that SN 1987A exhibits the normal evolution of a single star of about 20 solar mases having LMC abundances. Despite the variety of envelope behavior, the structure of the core at collapse is rather similar for the stars of a given mass. Variations due to different rates of mass loss are likely to be larger than those due to composition.