蓝离散星的数量能帮助我们确定母球状星团的年龄吗?

F. L. D. Andr'es
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引用次数: 0

摘要

最近的一项研究表明,从经验推断,疏散星团中蓝离散星(BSS)的数量和存在遵循一个函数,该函数的组成部分是年龄与松弛时间之间的比率$\it f$,以及一个因子$\varpi$,这是恒星碰撞加上原始双星的指标。根据蓝离散星的数量、每个球状星团的因子$\ f$和因子$\varpi$之间的关系,可以推算出各自球状星团的年龄。该方法已分别应用于56个含BSS的球状星团。从我们的方法中得出的群集年龄值与从其他方法中得出的值没有区别。一个特殊的例子是星系团NGC 104,它的年龄超过13.8 Gyr(它的年龄在19.04和20.30 Gyr之间),这将有一个非常奇特的解释:在星系团中心存在一个中间黑洞。初始轨道周期小于分岔周期的黑洞主序星(BH-MS)双星可以演化成可以被LISA探测到的超紧凑x射线双星(ucxb)。另一方面,如果这个年龄是真的,那么平坦宇宙的膨胀速度就会受到质疑。这将对暗能量主导宇宙的说法提出质疑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Could the number of blue straggler stars help to determine the age of their parent globular cluster?
A recent study shows, from an empirical deduction, that the number and the presence of the blue straggler stars (BSS) in an open cluster follow a function whose components are the ratio between age and the relaxation time, $\it f$, and a factor, $\varpi$ , which is an indicator of stellar collisions plus primordial binaries. The relation among the number of blue straggler stars, the factor $\it f$, and the factor $\varpi$ of each globular cluster allows for deriving the age of the respective globular clusters. This method has been applied individually over 56 globular clusters containing BSS. The values derived for the cluster ages from our methodology do not differ from those derived from other methods. A special case is cluster NGC 104 whose age exceeds 13.8 Gyr (its age is between 19.04 and 20.30 Gyr), which would have a very exotic explanation: the existence of an intermediate black hole in the center of the cluster. That black hole main-sequence star (BH-MS) binaries with an initial orbital period less than the bifurcation period can evolve into ultra-compact X-ray binaries (UCXBs) that can be detected by LISA. On the other hand, if that age were true, it would call into question the expansion velocity for a flat Universe. This would call into question the case for dark energy dominated Universe.
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