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来自一个0.26太阳质量恒星的RR-Lyrae类型的脉冲来自一个双星系统的双星系统
G Pietrzyński1, I B Thompson, W Gieren
1Departamento de Astronomìa, Universidad de Concepción, Casilla 160-C, Concepciòn, Chile. pietrzyn@astrouw.edu.pl
Nature
|April 7, 2012
概括
一个奇特的RR Lyrae恒星被发现是阴影二进制系统中的一个低质量物体. 这一发现表明,虽然很少见,但这种二进制系统可以模仿真正的RR Lyrae恒星,影响恒星人口研究.
科学领域:
- * 天文学和天体物理学
- * 恒星进化过程中的恒星进化
- * 银河系考古学 银河系考古学
背景情况:
- * RR Lyrae恒星对于确定银河系年龄和银河系外距离至关重要.
- * RR Lyrae 恒星通常是老的,低质量的脉动恒星.
- * 了解RR Lyrae恒星的质量对于准确的天体物理模型至关重要.
研究的目的:
- * 为了确定RR Lyrae恒星OGLE-BLG-RRLYR-02792.2的质量.
- * 为了研究恒星的进化路径在阴影二进制系统内.
- * 评估二进制星系对使用RR Lyrae恒星作为距离指标的影响.
主要方法:
- * 分析来自阴影二进制星系的光度数据.
- * 恒星进化模型用于解释观察到的属性.
- * 脉冲器的特性与经典的RR Lyrae恒星模型进行比较.
主要成果:
- * OGLE-BLG-RRLYR-02792的质量为0.26太阳质量,与经典的RR Lyrae恒星不一致.
- *该系统的属性是由一个具有初始质量为1.0M和0.8M的二进制系统的进化解释的.
- * 由于质量交换,观察到的脉冲星处于一个短暂的阶段,模仿RR Lyrae恒星.
结论:
- *所研究的物体不是经典的RR Lyrae恒星,而是一个进化的二进制星系.
- * 据估计,二进制入侵者只会污染RR Lyrae恒星的0.2%.
- *从RR Lyrae恒星获得的距离不太可能受到这样的双星系统的显著影响.
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