论文标题
太阳的摇篮
Cradle(s) of the Sun
论文作者
论文摘要
太阳很可能是一组恒星的一部分。一个太阳兄弟姐妹之一的近距离飞行可能是太阳系的质量分布中尖锐的外边缘的原因。这种近蝇的频率可用于确定太阳系的可能出生环境类型。年轻的恒星群体发展很快，在几点雄后大大扩展。在这里，我们对年轻恒星群体的这种强大的动态发展进行了建模，并确定了由此产生的近距离历史。我们发现，太阳系等效物主要是在恒星密度范围内的区域产生的，5 $ \ times $ 10 $^4 $ pc $^{ - 3} <$ n $ _ {local} <$ 2 $ \ times $ 10 $^5 $^5 $ pc $^{ - 3} $。值得注意的是，我们发现只有两种非常不同类型的恒星群可以被视为严肃的参赛者，例如太阳的摇篮 - 高质量，扩展的关联（$ M_C> $ 20 000 $ M_ {SUN} $）和中间质量，紧凑型组（$ M_C <$ 3000 $ M_ {SUN} $）。当前的同行分别是NGC 2244关联和M44群集。在这两种类型的恒星群中，近亲群以足够高的速度进行，同时也不会太破坏。剩下的两个选项之间的最终决定将需要纳入宇宙化学研究的约束。
The Sun likely formed as part of a group of stars. A close stellar flyby by one of the solar siblings is probably responsible for the sharp outer edge in the solar system`s mass distribution. The frequency of such close flybys can be used to determine the likely type of birth environment of the solar system. Young stellar groups develop very quickly, expanding significantly within just a few Myr. Here we model this strong dynamical development of young stellar groups and determine the resulting close flyby history. We find that solar system equivalents are predominantly produced in areas with stellar densities in the range 5 $\times$ 10$^4$ pc$^{-3}<$ n$_{local} <$ 2 $\times$ 10$^5$pc$^{-3}$. Remarkably we find that only two very distinct types of stellar groups can be considered as serious contestants as the cradle of the Sun -- high-mass, extended associations ($M_c >$ 20 000 $M_{sun}$) and intermediate-mass mass, compact clusters ($M_c <$ 3000 $M_{sun}$). Current day counterparts would be the association NGC 2244 and the M44 cluster, respectively. In these two types of stellar groups, close flybys take place at a sufficiently high rate, while not being too destructive either. A final decision between these two remaining options will require incorporation of constraints from cosmo-chemical studies.
