Constraints on blue straggler formation mechanisms in galactic globular clusters from proper motion velocity distributions
Constraints on blue straggler formation mechanisms in galactic globular clusters from proper motion velocity distributions
复制标题
自行速度分布对银河系球状星团蓝离散星形成机制的约束
DOI：
10.1093/mnras/sty2707
复制
发表时间：
2018
影响因子：
4.8
通讯作者：
Mathieu, R
中科院分区：
文献类型：
--
作者：
Leigh, N W;Panurach, T;Simunovic, M;Geller, A M;Zurek, D;Shara, M M;Sills, A;Knigge, C;Gosnell, N M;Mathieu, R
对于38个银河系球状星团（GCs）的样本，我们面对来自Simunovic & Puzia的BS星表中观测到的蓝离散星（BS）固有运动和质量（来自等时拟合）的分布，并对两种主要的竞争BS形成机制进行了理论预测。在一个紧密的双星系统中，质量从一个进化的供体转移到一个主序星（MS）上，以及在双星相遇中涉及MS星的直接碰撞。我们使用fewbodycode来模拟单二进制和二进制-二进制交互。这提供了碰撞速度和质量分布，以便与观测到的分布进行比较。大多数星团都符合从动态松弛人口中得到的BSs，支持二元传质情景。在一些星团中，包括我们样本中所有的核后坍缩星团，碰撞速度提供了最好的拟合。
For a sample of 38 galactic globular clusters (GCs), we confront the observed distributions of blue straggler (BS) proper motions and masses (derived from isochrone fitting) from the BS catalogue of Simunovic & Puzia with theoretical predictions for each of the two main competing BS formation mechanisms. These are mass transfer from an evolved donor on to a main-sequence (MS) star in a close binary system, and direct collisions involving MS stars during binary encounters. We use theFEWBODYcode to perform simulations of single–binary and binary–binary interactions. This provides collisional velocity and mass distributions for comparison to the observed distributions. Most clusters are consistent with BSs derived from a dynamically relaxed population, supportive of the binary mass-transfer scenario. In a few clusters, including all the post-core collapse clusters in our sample, the collisional velocities provide the best fit.
小 N 碰撞动力学：进入不那么小 N 的领域
DOI：
10.1111/j.1365-2966.2012.21689.x
发表时间：
2012
影响因子：
4.8
作者：
N. Leigh;A. Geller
通讯作者：
A. Geller
量化老星团中恒星初始质量函数的普遍性
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
N. Leigh;S. Umbreit;A. Sills;C. Knigge;G. Marchi;E. Glebbeek;A. Sarajedini
通讯作者：
A. Sarajedini