论文标题

上天蝎座和奥菲古斯的明星形成历史

The star formation history of Upper Scorpius and Ophiuchus

论文作者

Miret-Roig, N., Galli, P. A. B., Olivares, J., Bouy, H., Alves, J., Barrado, D.

论文摘要

我们旨在研究由上天蝎座和奥菲丘斯恒星形成区域所包含的区域的空间和运动学子结构,确定了动态的回溯年龄并研究该复合物的恒星形成历史。我们在该地区确定了七个不同的组。四组(NU SCO,Beta SCO,Sigma SCO和Delta SCO)是上天蝎座的一部分,在Ophiuchus中有两个组(Rho Oph和Alpha SCO),而另一组(PI SCO)是附近的年轻人。我们发现了从Rho OPH组(最小)到Delta SCO组(<〜5 Myr)的年龄梯度,这表明Star组是过去5 MYR的顺序过程。我们的追溯分析表明,上天蝎座和Rho Oph组具有共同的起源。 PI SCO的近距离可能较旧,回溯分析表明,该组和Alpha SCO组具有不同的起源,可能与SCO-CEN复合物中的其他关联有关。我们的研究表明,该区域具有复杂的恒星形成历史,它超出了当前的形成场景,这可能是巨大恒星,超新星爆炸的恒星反馈以及恒星基团与分子气体之间的动态相互作用的结果。特别是,我们推测来自大型Delta SCO星的照片离世可能首先在Beta SCO组中触发了Star组,然后在NU SCO组中触发了恒星。由于出色的反馈和动态相互作用引起的恒星轨道的扰动也可能导致我们在动态的追溯年龄和等应体年龄之间发现的1-3 MYR差异。

We aim to study spatial and kinematic substructures of the region encompassed by Upper Scorpius and Ophiuchus star-forming regions, determining dynamical traceback ages and studying the star formation history of the complex. We identified seven different groups in this region. Four groups (nu Sco, beta Sco, sigma Sco and delta Sco) are part of Upper Scorpius, two groups (rho Oph and alpha Sco) are in Ophiuchus, and another group (pi Sco) is a nearby young population. We found an age gradient from the rho Oph group (the youngest) to the delta Sco group (<~5 Myr), showing that star formation was a sequential process for the past 5 Myr. Our traceback analysis shows that Upper Scorpius and rho Oph groups share a common origin. The closer group of pi Sco is probably older, and the traceback analysis suggests that this group and the alpha Sco group have a different origin, likely related to other associations in the Sco-Cen complex. Our study shows that this region has a complex star formation history that goes beyond the current formation scenario, likely a result of stellar feedback from massive stars, supernovae explosions, and dynamic interactions between stellar groups and the molecular gas. In particular, we speculate that photo-ionisation from the massive delta Sco star could have triggered star formation first in the beta Sco group and then in the nu Sco group. The perturbations of stellar orbits due to stellar feedback and dynamical interactions could also be responsible for the 1-3 Myr difference that we found between dynamical traceback ages and isochronal ages.

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