Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications

Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications
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富氦热亚矮星和单个低质量白矮星:形成机制和进一步影响

DOI:
10.1007/s10509-010-0341-y
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发表时间:
2010-03
影响因子:
1.9
通讯作者:
Wolf, Christian
Wolf, Christian
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Justham, Stephen;Podsiadlowski, Philipp;Han, Zhanwen;Wolf, Christian

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单颗恒星质量损失的变化已经被用来解释热亚矮星和单个低质量白色矮星(LMWD)的存在。因此,单个红巨星质量损失的不确定性对于理解这些问题很重要。然而,也有人提出热次矮星和单个低分子量分布的自然形成通道,这些通道不依赖于单个红巨星的无法解释的质量损失。我们概述了这些,并讨论如何区分不同的机制。例如,一个单一的LMWD的形成通道,涉及到一个Ia型超新星的双星系统的分裂,应该产生一个人口的单一的LMWD与一个独特的运动学签名。如果发现这个群体存在,它可以用来研究一个流行的单简并形成通道的Ia型超新星在以前不可能的方式。此外,我们研究了形成的富氦sdO星,这是从以前存在的二进制形成通道热亚矮星。单个LMWDs的Ia超新星形成机制和He-sdOs的形成通道都是现有模型的自然结果。因此,如果这些形成渠道不工作,那么结果是一个显着的。
Variations in the mass loss from single stars have been used to explain the existence of hot subdwarf stars and the existence of single low-mass white dwarfs (LMWDs). Hence remaining uncertainty in mass loss from single red-giant stars is important to the understanding of these problems. However, natural formation channels for hot subdwarfs and single LMWDs have also been proposed which do not rely on unexplained mass loss from single red-giant stars. We outline these, and discuss how the different mechanisms could be distinguished. For example, a formation channel for single LMWDs which involves the break-up of a binary system by a type Ia supernova should produce a population of single LMWDs with a distinct kinematic signature. If that population is found to exist, it could be used to study one of the popular single-degenerate formation channels for type Ia supernovae in a previously impossible way. In addition, we examine the formation of helium-rich sdO stars—which are shown to emerge from one of the previously existing binary formation channels for hot subdwarfs. Both the SN Ia formation mechanism for single LMWDs and the formation channel for He-sdOs are a natural consequence of existing models. Hence if these formation channels do not work at all, then the result is a significant one.
不同金属丰度恒星的初始-最终质量关系
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