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arXiv 1601.00447astro-ph.GA
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太阳诞生星团的演化和寻找盖亚的太阳兄弟姐妹

The evolution of the Sun's birth cluster and the search for the solar siblings with Gaia

C. A. Martínez-Barbosa, A. G. A. Brown, T. Boekholt, S. Portegies Zwart, E. Antiche, T. Antoja

摘要:

我们使用自洽的数值模拟的演化和破坏的太阳的诞生集群在银河系的潜力,调查当今的相空间分布的太阳的兄弟姐妹。模拟包括星系团内的引力N体力和恒星演化对星系团人口的影响。此外,由于银河系潜力的引力占在一个自洽的方式。我们的目标是了解如何从盖亚任务的天体测量和径向速度数据可以用来预选太阳兄弟候选人。我们改变太阳诞生星团的初始条件,以及银河系的潜力参数。我们表明,集群的中断时间尺度是不敏感的银河系模型的非轴对称组件的细节,我们作出预测,平均在不同的模拟的可能性,太阳兄弟姐妹的数量,应该出现在调查,如盖亚或GALAH。我们发现了大量的各种各样的太阳兄弟姐妹,这取决于集群的初始条件和银河系模型参数的相空间分布。我们发现,尽管如此强大的预测,可以作出有关的位置的太阳兄弟姐妹在空间中的视差($\varpi$),自行($μ$)和径向速度($V_\mathrm{r}$)。通过计算模拟的太阳兄弟星数目与模型银盘中恒星数目的比值,我们发现这个比值在以下区域大于0.5:$\varpi \geq 5$ mas,$4 \leq μ\leq 6$ masyr $^{-1}$,和$-2\leq V_\mathrm{r} \leq 0$ kms $^{-1}$ .从这个区域选择恒星应该会增加通过后续观测成功识别太阳兄弟姐妹的可能性。

英文摘要:

We use self-consistent numerical simulations of the evolution and disruption of the Sun's birth cluster in the Milky Way potential to investigate the present-day phase space distribution of the Sun's siblings. The simulations include the gravitational N-body forces within the cluster and the effects of stellar evolution on the cluster population. In addition the gravitational forces due to the Milky Way potential are accounted for in a self-consistent manner. Our aim is to understand how the astrometric and radial velocity data from the Gaia mission can be used to pre-select solar sibling candidates. We vary the initial conditions of the Sun's birth cluster, as well as the parameters of the Galactic potential. We show that the disruption time-scales of the cluster are insensitive to the details of the non-axisymmetric components of the Milky Way model and we make predictions, averaged over the different simulated possibilities, about the number of solar siblings that should appear in surveys such as Gaia or GALAH. We find a large variety of present-day phase space distributions of solar siblings, which depend on the cluster initial conditions and the Milky Way model parameters. We show that nevertheless robust predictions can be made about the location of the solar siblings in the space of parallaxes ($\varpi$), proper motions ($μ$) and radial velocities ($V_\mathrm{r}$). By calculating the ratio of the number of simulated solar siblings to that of the number of stars in a model Galactic disk, we find that this ratio is above 0.5 in the region given by: $\varpi \geq 5$mas, $4 \leq μ\leq 6$masyr$^{-1}$, and $-2\leq V_\mathrm{r} \leq 0$kms$^{-1}$. Selecting stars from this region should increase the probability of success in identifying solar siblings through follow up observations [Abridged].

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