arXiv 2204.136262022-04-28astro-ph.SR

激变变星演化的统一模式

A unified model for the evolution of cataclysmic variables

Arnab Sarkar, Christopher A. Tout

备注：: Accepted for publication in MNRAS
DOI：: 10.1093/mnras/stac1187

摘要：

我们给出了剑桥恒星演化代码（STARS）中使用的解析状态方程的更新版本，作为一个免费使用的开源软件包，我们已经用来模拟冷白矮星的温度$\log_{10}(T_\mathrm{eff}/\mathrm{K})\:=\;3$。随着这一更新的STARS代码，我们使用双发电机模型的长期演化激变变星（CV），其中有两个$α-Ω$发电机之间的相互作用，一个在对流信封和其他在一个缓慢旋转收缩的辐射核心和不断增长的对流信封的边界。我们确认，该模型提供了一个物理形式主义的中断磁制动范例。此外，我们的模型还提供了一个机制，额外的角动量损失低于周期间隙。我们利用激变变星中白矮星的{mass}分布构造了轨道周期的相对概率分布$P_\mathrm{orb}$，发现我们的模型很好地再现了CV分布中的周期间隙和观测到的周期最小尖峰。我们还比较了我们的模型与其他经验模型的演化轨迹，并发现两者之间的协议。我们还报告了我们的模拟系统和观测数据之间的良好协议。

英文摘要：

We give an updated version of the analytical equation of state used in the Cambridge stellar evolution code (STARS) as a free to use open-source package that we have used to model cool white dwarfs down to temperatures $\log_{10}(T_\mathrm{eff}/\mathrm{K})\:=\;3$. With this update in the STARS code we model the secular evolution of cataclysmic variable (CV) stars using a double dynamo model wherein there is an interplay between two $α-Ω$ dynamos, one in the convective envelope and the other at the boundary of a slowly rotating shrinking radiative core and the growing convective envelope. We confirm that this model provides a physical formalism for the interrupted magnetic braking paradigm. In addition, our model also provides a mechanism for extra angular momentum loss below the period gap. We construct the relative probability distribution of orbital periods $P_\mathrm{orb}$ using the {mass} distribution of white dwarfs in cataclysmic variables and find that our model excellently reproduces the period gap and the observed period minimum spike in CV distribution. We also compare the evolutionary trajectories from our model with those of other empirical models and find agreement between the two. We also report good agreement between our modelled systems and observational data.

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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英文摘要：

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