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A Binary Origin For 'blue Stragglers' In Globular Clusters

机译：球状星团中“蓝色流浪者”的二进制起源

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摘要

Blue stragglers in globular clusters are abnormally massive stars that should have evolved off the stellar main sequence long ago. There are two known processes that can create these objects: direct stellar collisions and binary evolution. However, the relative importance of these processes has remained unclear. In particular, the total number of blue stragglers found in a given cluster does not seem to correlate with the predicted collision rate3'4, providing indirect support for the binary-evolution model. Yet the radial distributions of blue stragglers in many clusters are bimodal, with a dominant central peak: this has been interpreted as an indication that collisions do dominate blue straggler production, at least in the high-density cluster cores. Here we report that there is a clear, but sublinear, correlation between the number of blue stragglers found in a cluster core and the total stellar mass contained within it. From this we conclude that most blue stragglers, even those found in cluster cores, come from binary systems. The parent binaries, however, may themselves have been affected by dynamical encounters. This may be the key to reconciling all of the seemingly conflicting results found to date.
机译：球状星团中的蓝色散落者是异常大质量的恒星，应该早在恒星的主要序列中演化出来的。有两个已知的过程可以创建这些对象：直接恒星碰撞和二进制演化。但是，这些过程的相对重要性仍不清楚。特别是，在给定簇中发现的蓝色散乱鸟总数似乎与预测的碰撞率不相关3'4，从而为二进制进化模型提供了间接支持。但是，许多簇中蓝散流虫的径向分布是双峰的，具有一个主要的中心峰：这已被解释为表明碰撞至少在高密度簇核中占主导地位。在这里，我们报告说，在簇状核中发现的蓝色散流虫数量与其中包含的总恒星质量之间存在清晰但次线性的相关性。由此得出的结论是，大多数蓝色散乱者，甚至在集群核心中发现的散乱者，都来自二进制系统。但是，父二进制文件本身可能已受到动态相遇的影响。这可能是调和迄今为止发现的所有看似矛盾的结果的关键。

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  • 来源
    《Nature》 |2009年第7227期|p.288-290|共3页
  • 作者

    Christian Knigge; Nathan Leigh; Alison Sills;

  • 作者单位

    University of Southampton, School of Physics and Astronomy, Southampton SO17 1BJ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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