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arXiv 0710.0139astro-ph
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从银河系中心的恒星盘中得到乐趣

Getting a kick out of the stellar disk(s) in the galactic center

Hagai B. Perets, Gabor Kupi, Tal Alexander

摘要:

最近对银河系中心的观测揭示了一个由年轻OB星组成的核盘,此外还有许多类似的外围恒星,它们具有更高的偏心率和/或相对于盘的高倾角(其中一些可能属于第二个盘)。在这种核盘中的双星,如果它们以不可忽略的比例存在,可能通过双星加热这个恒星系统在盘的演化中发挥重要作用。我们认为,与/在二进制的相互作用可能会解释一些(或所有)观察到的银河系中心的外围年轻恒星。这样的恒星可能是在一个圆盘中形成的,后来通过与双星相关的相互作用被踢出,类似于整个星系中年轻星团中高速逃逸的OB星的喷射。

英文摘要:

Recent observations of the Galactic center revealed a nuclear disk of young OB stars, in addition to many similar outlying stars with higher eccentricities and/or high inclinations relative to the disk (some of them possibly belonging to a second disk). Binaries in such nuclear disks, if they exist in non-negligible fractions, could have a major role in the evolution of the disks through binary heating of this stellar system. We suggest that interactions with/in binaries may explain some (or all) of the observed outlying young stars in the Galactic center. Such stars could have been formed in a disk, and later on kicked out from it through binary related interactions, similar to ejection of high velocity runaway OB stars in young clusters throughout the galaxy.

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