亚矮星B星的起源

Q3 Multidisciplinary

Bulletin de la Societe Royale des Sciences de Liege Pub Date : 2023-01-01 DOI:10.25518/0037-9565.11190

Callum AUBREY, Ralf NAPIWOTZKI

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引用次数: 2

摘要

亚矮星B星(sdBs)的起源尚不清楚。提出了近双星演化、红巨星分支氦混合和热闪假说等不同的形成途径。有间接证据表明，在金属丰度较高的恒星群中，单星演化可能产生小恒星。我们通过使用薄、厚盘和晕族的隶属度作为金属丰度指标来研究这种可能性。径向速度测量与盖亚固有运动相结合来计算银河系的空间运动。推导出了星系轨道和星系群的隶属关系。初步结果表明，薄盘成员(86个)比厚盘和光晕成员(28个)多。显然，在这三个人群中都发现了单个sdb。我们研究了不同类型的温度分布，并讨论了其对地层情景的影响。

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The origin of subdwarf B stars

The origin of subdwarf B stars (sdBs) is unclear. Different formation channels are proposed including: close-binary evolution, helium-mixing on the red giant branch and the hot flasher scenario. Circumstantial evidence exists that sdBs can result from single star evolution in high metallicity populations. We investigate this possibility by using membership in the thin, thick disk and halo populations as a metallicity indicator. Radial velocity measurements were com-bined with Gaia proper motions to calculate space motions in the Galaxy. Galactic orbits and population memberships were derived. Preliminary results indicate more sdBs are members of the thin disk (86 sdBs) than of thick disk and halo (28 sdBs). Apparently single sdBs are found among all three populations. We look into the temperature distributions of the different types and discuss implication for formation scenarios.

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来源期刊

Bulletin de la Societe Royale des Sciences de Liege Multidisciplinary-Multidisciplinary

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： The ‘Société Royale des Sciences de Liège" (hereafter the Society) regularly publishes in its ‘Bulletin" original scientific papers in the fields of astrophysics, biochemistry, biophysics, biology, chemistry, geology, mathematics, mineralogy or physics, following peer review approval.