The Formation of Subdwarf A-type Stars
The Formation of Subdwarf A-type Stars
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亚矮星A型恒星的形成
DOI：
10.3847/1538-4357/ab44b5
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发表时间：
2019-09
影响因子：
4.9
通讯作者：
Wang Zhaojun
中科院分区：
文献类型：
--
作者：
Yu Jinlong;Li Zhenwei;Zhu Chunhua;Wang Zhaojun
亚矮A型星（sdAs）是一类天体，其光谱富含氢，表面重力与热亚矮星相近，但有效温度低于零龄水平分支。它们被认为是贫金属主序（MS）星 。
不过你原文最后“sta”似乎不完整，推测完整内容后翻译可能会更准确。
Subdwarf A-type stars (sdAs) are objects that have hydrogen-rich spectra with surface gravity similar to that of hot subdwarf stars but effective temperature below the zero-age horizontal branch. They are considered to be metal-poor main-sequence (MS) stars or extremely low-mass white dwarfs (ELM WDs). In this work, using the stellar evolution code Modules for Experiments in Stellar Astrophysics, we investigate the sdAs formed both by the evolution of (pre-)ELM WDs in double-degenerate systems and metal-poor MS stars with single evolution models. We find that both of the evolutionary tracks of ELM WDs and metal-poor MS stars can explain the observation properties of sdAs. However, the proportions between these two populations are uncertain. In this work, we adopt the method of binary population synthesis of both ELM WDs in the disk and metal-poor MS stars in the halo to obtain their populations at different stellar population ages and calculate their proportions. We find that the proportion of metal-poor MS stars to sdAs for a stellar population of 10 Gyr is ∼98.5%, which is consistent with the conclusion that most sdAs (>95%) are metal-poor MS stars. And the proportion of ELM WDs (metal-poor MS stars) to sdAs increases (decreases) from 0.1% (99.9%) to 20% (80%) with stellar population ages from 5 to 13.7 Gyr.
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影响因子：
4.8
作者：
I. Pelisoli;K. Bell;K. Bell;S. O. Kepler;D. Koester
通讯作者：
I. Pelisoli;K. Bell;K. Bell;S. O. Kepler;D. Koester
DOI：
10.1007/978-94-011-3230-5_8
发表时间：
1992-07
期刊：
--
影响因子：
--
作者：
P. Bergeron;R. Saffer;J. Liebert
通讯作者：
P. Bergeron;R. Saffer;J. Liebert
原始二元演化和蓝色落后者
DOI：
10.1111/j.1365-2966.2009.14669.x
发表时间：
2009-03
影响因子：
4.8
作者：
Chen, Xuefei;Han, Zhanwen
通讯作者：
Han, Zhanwen
影响因子：
4.8
作者：
R. Cohen;C. M. Bidin;F. Mauro;C. Bonatto;Douglas Geisler Universidad de Concepcion;Universidad Cat'olica del Norte-Universida
通讯作者：
R. Cohen;C. M. Bidin;F. Mauro;C. Bonatto;Douglas Geisler Universidad de Concepcion;Universidad Cat'olica del Norte-Universida
辐照对超紧凑 X 射线双星演化的影响
影响因子：
4.9
作者：
Lu Guoliang;Zhu Chunhua;Wang Zhaojun;Iminniyaz Hoernisa
通讯作者：
Iminniyaz Hoernisa