Mass transfer from a giant star to a main-sequence companion and its contribution to long-orbital-period blue stragglers
Mass transfer from a giant star to a main-sequence companion and its contribution to long-orbital-period blue stragglers
复制标题
从巨星到主序伴星的质量转移及其对长轨道周期蓝离散星的贡献
DOI：
10.1111/j.1365-2966.2008.13334.x
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发表时间：
2008-04
影响因子：
4.8
通讯作者：
Chen, Xuefei
中科院分区：
文献类型：
--
作者：
Han, Zhanwen;Chen, Xuefei
双星总体合成表明，从一个巨大的星星到一个主序星（MS）的伴星的质量转移可以解释一些观察到的长轨道周期的蓝离散星。然而，很少有人注意到这种蓝离散星形成的情况下，动力学不稳定往往发生时，质量供体是一个巨大的星星。本文用详细的演化计算方法研究了从巨星星到MS伴星动态稳定质量转移的临界质量比q（c）。结果表明，一个更先进的星星一般是不稳定的洛希叶溢出。同时，q（c）几乎与质量和角动量的损失成线性关系，而与恒星风的关系不大。为了方便使用的结果，我们给出了一个拟合的q（c）作为一个函数的恒星半径在洛希瓣溢出的开始和洛希瓣溢出期间的质量传递效率。为了研究巨星和MS星之间的质量转移形成的蓝离散星，我们进行了不同q（c）的Monte Carlo模拟。模拟结果表明，某些质量施主在第一巨分支上的双星可能对蓝离散星有贡献，而对蓝离散星没有贡献。同时，从我们的q（c），蓝离散的质量转移之间的一个渐近巨星分支星星和MS的伴星可能是更多的，并有一个更广泛的轨道周期范围比从其他q（c）。
Binary population synthesis shows that mass transfer from a giant star to a main-sequence ( MS) companion may account for some observed long-orbital-period blue stragglers. However, little attention is paid to this blue straggler formation scenario as dynamical instability often happens when the mass donor is a giant star. In this paper, we have studied the critical mass ratio, q(c), for dynamically stable mass transfer from a giant star to a MS companion using detailed evolution calculations. The results show that a more evolved star is generally less stable for Roche lobe overflow. Meanwhile, q(c) almost linearly increases with the amount of the mass and angular momentum lost during mass transfer, but has little dependance on stellar wind. To conveniently use the result, we give a fit of q(c) as a function of the stellar radius at the onset of Roche lobe overflow and of the mass-transfer efficiency during the Roche lobe overflow. To examine the formation of blue stragglers from mass transfer between giants and MS stars, we have performed Monte Carlo simulations with various q(c). The simulations show that some binaries with the mass donor on the first giant branch may contribute to blue stragglers with q(c) obtained in this paper but will not from previous q(c). Meanwhile, from our q(c), blue stragglers from the mass transfer between an asymptotic giant branch star and a MS companion may be more numerous and have a wider range of orbital periods than those from the other q(c).
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DOI：
10.1086/421460
发表时间：
2004-04
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
O. De Marco;T. Lanz;J. Ouellette;D. Zurek;M. Shara
通讯作者：
O. De Marco;T. Lanz;J. Ouellette;D. Zurek;M. Shara
DOI：
10.1046/j.1365-8711.2002.05752.x
发表时间：
2002-06
影响因子：
4.8
作者：
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通讯作者：
Zhanwen Han;P. Podsiadlowski;P. Maxted;T. Marsh;N. Ivanova
影响因子：
4.8
作者：
K. Schröder;O. Pols;P. Eggleton
通讯作者：
K. Schröder;O. Pols;P. Eggleton
DOI：
10.1046/j.1365-8711.2002.05038.x
发表时间：
2002-01
影响因子：
4.8
作者：
J. Hurley;C. Tout;O. Pols
通讯作者：
J. Hurley;C. Tout;O. Pols
影响因子：
6.5
作者：
J. Ahumada;E. Lapasset
通讯作者：
J. Ahumada;E. Lapasset