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The origin of blue straggler stars in star clusters

星团中蓝离散星的起源

基本信息

批准号：
196496450
负责人：
Professor Dr. Pavel Kroupa
金额：
--
依托单位：
Helmholtz-Institut für Strahlen- und Kernphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/196496450?language=en
关键词：
origin blue straggler stars star

项目摘要

The blue stragglers (hereafter BS) of a stellar population are classified as those main-sequence members which are bluer than the primary main-sequence population and appear as an extension of the main sequence in the colour-magnitude diagram beyond the main sequence turn-off. BSs are found in significant numbers in a wide range of stellar environments beginning from low-mass open clusters to massive globular clusters and as well in galactic fields. They are believed to be stars rejuvenated via stellar collisions, mergers or binary evolution. BSs in star clusters are interesting due to the correlations of their population with different cluster parameters and their remarkable multiplicity properties, as obtained through high-resolution imaging and measurements of proper motions. These properties have prompted detailed studies on their origin. Theoretical work involves semi-analytic methods to understand the correlations with cluster parameters and also using direct N-body computations to study the population and multiplicity properties of BSs in specific open clusters. In this proposed study, the dependencies of the BS population and of their various formation channels on cluster parameters are to be investigated through direct N-body integrations of model clusters in order to understand the observed correlations. In addition to this general study, two very remarkable BS populations will be focused on, viz., that of the open cluster NGC 188 and of the globular cluster M30.

恒星群中的蓝离散星（以下简称BS）被归类为那些比主序星群更蓝的主序星成员，它们在主序星的色星等图中作为主序星的延伸出现在主序星的关闭点之外。从低质量疏散星团到大质量球状星团，在各种恒星环境中，以及银河系中，都发现了大量的黑洞。它们被认为是通过恒星碰撞、合并或双星演化而重新焕发活力的恒星。通过高分辨率成像和固有运动测量得到星团中的BSs，由于其人口与不同星团参数的相关性以及它们显著的多重特性而引起了人们的兴趣。这些特性促使人们对它们的起源进行了详细的研究。理论工作包括半解析方法来理解与簇参数的相关性，以及使用直接n体计算来研究特定开放簇中BSs的种群和多重特性。在本研究中，我们将通过模型聚类的直接n体积分来研究BS种群及其各种形成通道对聚类参数的依赖关系，以了解观察到的相关性。除了这个一般性的研究，我们还将重点关注两个非常引人注目的BS群，即疏散星团NGC 188和球状星团M30。