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arXiv 2103.13627astro-ph.SRastro-ph.GA
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在双星系统中经历超新星爆炸的第一颗恒星幸存者作为富含金属的晕星

First Star Survivors as Metal-Rich Halo Stars that Experienced Supernova Explosions in Binary Systems

Takuma Suda, Takayuki R. Saitoh, Yuki Moritani, Tadafumi Matsuno, Toshikazu Shigeyama

摘要:

在宇宙中寻找第一批由无金属气体形成的恒星是天文学的关键问题之一,因为它涉及到许多领域,如恒星和星系的形成,宇宙的演化以及元素的起源。目前还不清楚是否可以在目前的宇宙中找到无金属的第一颗恒星。这些第一批恒星被认为存在于我们银河系晕中极贫金属的恒星中。在这里,我们提出了一个新的方案,形成低质量的第一颗恒星,一直生存到今天,在我们的银河系观测同行。双星系统中的第一批恒星,包括大质量和低质量的恒星,检查使用恒星演化模型,模拟超新星喷出物碰撞低质量的同伴,并与观测数据的比较。这些第一批恒星幸存者将作为我们银河系中富含金属的晕星被观察到。我们可能已经确定了一个候选恒星的观测数据库中的元素丰度和运动学数据。我们的模型也占存在的几个太阳金属丰度恒星在文献中的空间速度相当于晕人口。该方案要求在早期宇宙中有一个新的恒星形成通道,是对已知贫金属恒星起源的补充方案。

英文摘要:

The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars and galaxies, the evolution of the universe, and the origin of elements. It is not still clear if metal-free first stars can be found in the present universe. These first stars are thought to exist among extremely metal-poor stars in the halo of our Galaxy. Here we propose a new scenario for the formation of low-mass first stars that have survived until today and observational counterparts in our Galaxy. The first stars in binary systems, consisting of massive- and low-mass stars, are examined using stellar evolution models, simulations of supernova ejecta colliding with low-mass companions, and comparisons with observed data. These first star survivors will be observed as metal-rich halo stars in our Galaxy. We may have identified a candidate star in the observational database where elemental abundances and kinematic data are available. Our models also account for the existence of several solar-metallicity stars in the literature having space velocities equivalent to the halo population. The proposed scenario demands a new channel of star formation in the early universe and is a supplementary scenario for the origin of the known metal-poor stars.

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