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球状星团中的"蓝色滞留者"的二进制起源
Christian Knigge1, Nathan Leigh, Alison Sills
1University of Southampton, School of Physics and Astronomy, Southampton SO17 1BJ, UK. christian@astro.soton.ac.uk
Nature
|January 17, 2009
概括
球状星团中的大多数蓝色落后者起源于双星进化,而不是碰撞. 即使是核心蓝色滞后者也主要来自二进制系统,可能受到动态碰撞的影响.
科学领域:
- 恒星天体物理学 恒星天体物理学
- 银河系的动力学
- 太阳系外行星研究
背景情况:
- 蓝色滞后者是球状星团中异常大质量的恒星,它们违背了标准的恒星进化时间线.
- 它们的形成归因于直接的恒星碰撞或双星进化.
- 这两种机制的相对贡献在天体物理学中仍然是一个重要的问题.
研究的目的:
- 调查球状星团核心中蓝色滞后者的主导形成机制.
- 为了协调关于蓝色滞留者形成路径的相互矛盾的观测证据.
- 为了确定蓝色滞留者种群和集群属性之间的关系.
主要方法:
- 在球状星团核心内分析蓝色滞留者种群.
- 蓝色滞后者数量与星团核心中的恒星总质量之间的相关性分析.
- 观察到的蓝色滞留者分布与预测的碰撞和二进制进化率的比较.
主要成果:
- 星团核心中的蓝色滞后者数量与其总恒星质量之间存在明显的亚线性相关性.
- 这种相关性表明,二进制进化是蓝色滞后者的主要来源,即使在密集的核心区域.
- 观察到的辐射分布,以前被解释为碰撞的证据,可以与二进制进化相协调.
结论:
- 大多数蓝色滞留者,包括集群核心中的蓝色滞留者,都是通过双星进化形成的.
- 动态相遇可能影响了父二进制系统,解释了一些观测差异.
- 二元进化,可能被动态相互作用修改,是最有可能占主导地位的蓝色滞留者形成的途径.
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