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arXiv 2209.01007astro-ph.SRastro-ph.HE
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质量损失与Eddington参数

Mass loss and the Eddington parameter

Joachim M. Bestenlehner

AI总结:

本文扩展了经典星风理论以解释极超巨星质量损失对Eddington参数的依赖,并推导出适用于大麦哲伦云的质量损失方案。

摘要:

通过星风产生的质量损失在大质量恒星演化中起主导作用。极超巨星(VMSs,$> 100 M_{\odot}$)在主序阶段展现出Wolf-Rayet光谱形态(WNh)。Bestenlehner (2020) 将Castor, Abbott & Klein (1975) 提出且被广泛使用的经典星风理论,从光学薄(O星)扩展至光学厚的主序(WNh)星风区域。新的质量损失描述能够解释质量损失对Eddington参数的经验依赖关系,并适用于纳入大质量与极超巨星演化模型。该公式可利用Vink & Gräfener (2012) 中定义的过渡质量损失率进行校准。基于Bestenlehner et al. (2014) 给出的恒星样本,我们使用Bestenlehner (2020) 的新理论质量损失公式,推导出了适用于大麦哲伦云的质量损失方案。

英文摘要:

Mass loss through stellar winds plays a dominant role in the evolution of massive stars. Very massive stars (VMSs, $> 100 M_{\odot}$) display Wolf-Rayet spectral morphologies (WNh) whilst on the main-sequence. Bestenlehner (2020) extended the elegant and widely used stellar wind theory by Castor, Abbott & Klein (1975) from the optically thin (O star) to the optically thick main-sequence (WNh) wind regime. The new mass-loss description is able to explain the empirical mass-loss dependence on the Eddington parameter and is suitable for incorporation into stellar evolution models for massive and very massive stars. The prescription can be calibrated with the transition mass-loss rate defined in Vink & Gräfener (2012). Based on the stellar sample presented in Bestenlehner et al. (2014) we derive a mass-loss recipe for the Large Magellanic Cloud using the new theoretical mass-loss prescription of Bestenlehner (2020).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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