The blue stragglers formed via mass transfer in old open clusters
The blue stragglers formed via mass transfer in old open clusters
复制标题
蓝离散星是通过旧疏散星团中的传质形成的
DOI：
10.1051/0004-6361:20064879
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发表时间：
2006-04
影响因子：
6.5
通讯作者：
中科院分区：
文献类型：
--
作者：
在本文中，我们基于演化过程的详细建模，对旧疏散星团 M 67 中的原始蓝离散星进行了模拟。主要目的是讨论 M 67 中接近的双星组分之间的质量传递对蓝色离散粒子的贡献。方法。首先，我们跟踪了 1.4 M 圆点 + 0.9 M 圆点的二元演化。双星系统的综合进化轨迹表明，在颜色-星等图观测到的蓝离散星区域中，原始蓝离散星具有较长的寿命。其次，计算了经历质量交换的紧密双星系统的模型网格，范围为 1 Gyr 到 6 Gyr，以便解释时间序列中原始蓝离散星的形成。基于这样的网格，对旧的疏散星团 M 67 进行了蒙特卡罗模拟。结果。采用适当的轨道参数，我们的模拟预测了 4 个原初蓝离散星。这与 M 67 中只有少数蓝离散星是轨道周期短的双星这一观测事实是一致的。定义了颜色幅度图（CMD）中原始蓝色离散粒子的上边界，可用于区分不是通过质量交换形成的蓝色离散粒子。使用二元模型网格，可以预测原始BS的轨道周期。结论。与观测结果相比，很明显，仅靠本文讨论的机制并不能完全预测 M 67 中的蓝离散粒子数量。在 M 67 中观察到的蓝离散粒子的形成肯定还涉及其他几个过程。
In this paper, we present the simulations for the primordial blue stragglers in the old open cluster M 67 based on detailed modelling of the evolutionary processes. The principal aim is to discuss the contribution of mass transfer between the components of close binaries to the blue straggler population in M 67. Methods. First, we followed the evolution of a binary of 1.4 M-circle dot + 0.9 M-circle dot. The synthetic evolutionary track of the binary system revealed that a primordial blue straggler had a long lifetime in the observed blue straggler region of color-magnitude diagram. Second, a grid of models for close binary systems experiencing mass exchange were computed from 1 Gyr to 6 Gyr in order to account for primordial blue-straggler formation in a time sequence. Based on such a grid, Monte- Carlo simulations were applied for the old open cluster M 67. Results. Adopting appropriate orbital parameters, 4 primordial blue stragglers were predicted by our simulations. This was consistent with the observational fact that only a few blue stragglers in M 67 were binaries with short orbital periods. An upper boundary of the primordial blue stragglers in the color-magnitude diagram (CMD) was defined and could be used to distinguish blue stragglers that were not formed via mass exchange. Using the grid of binary models, the orbital periods of the primordial BSs could be predicted. Conclusions. Compared with the observations, it is clear that the mechanism discussed in this work alone cannot fully predict the blue straggler population in M 67. There must be several other processes also involved in the formation of the observed blue stragglers in M 67.
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DOI：
10.1051/aas:1997373
发表时间：
1997-01
期刊：
Astronomy & Astrophysics Supplement Series
影响因子：
--
作者：
T. Lejeune;F. Cuisinier;R. Inst.;U. Basel;CH Obs. Astron.;Strasbourg;FR Ins. Astron. e Geof.
通讯作者：
T. Lejeune;F. Cuisinier;R. Inst.;U. Basel;CH Obs. Astron.;Strasbourg;FR Ins. Astron. e Geof.
影响因子：
4.8
作者：
P. Kroupa;C. Tout;G. Gilmore
通讯作者：
P. Kroupa;C. Tout;G. Gilmore
DOI：
10.1086/339060
发表时间：
2001-07
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Lombardi, Jr.;Jessica S. Warren;F. Rasio;A. Sills;A. Warren
通讯作者：
J. Lombardi, Jr.;Jessica S. Warren;F. Rasio;A. Sills;A. Warren
DOI：
--
发表时间：
1998
期刊：
--
影响因子：
--
作者：
T. Lejeune;R. Buser
通讯作者：
T. Lejeune;R. Buser
影响因子：
4.9
作者：
ALEXANDER, DR;FERGUSON, JW
通讯作者：
FERGUSON, JW