A Strontium-rich Ultra Metal-poor Star in the Atari Disk Component

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-12-20 DOI:10.1093/mnrasl/slad197

M. Mardini, A. Frebel, A. Chiti

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Abstract

We report on the discovery of the first ultra metal-poor (UMP) star 2MASS J20500194−6613298 (J2050−6613; [Fe/H] = −4.05) selected from the Gaia BP/RP spectral catalog that belongs to the ancient Atari disk component. We obtained a high-resolution spectrum for the star with the MIKE spectrograph on the Magellan-Clay telescope. J2050−6613 displays a typical chemical abundance pattern for UMP stars, including carbon and zinc enhancements. In contrast, J2050−6613 shows extremely high [Sr/Fe] and [Sr/Ba] ratios compared to other stars in the [Fe/H] <−4.0 regime. J2050−6613 is most likely an early Population II star that formed from a gas cloud that was chemically enriched by a massive Population III hypernova (E >1052 erg). Such a Population III core-collapse hypernova could simultaneously explain the origin of the abundance pattern of light and heavy elements of 2MASS J2050−6613 if a large amount of Sr of ∼10−5 M⊙ was produced, possibly by neutrino-driven (wind) ejecta. Therefore, the abundance pattern of 2MASS J2050−6613 places important constraints on Sr-producing nucleosynthesis sources operating in the Atari progenitor at the earliest times.

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阿塔里盘成分中的一颗富锶超贫金属星

我们报告了从盖亚BP/RP光谱星表中发现的第一颗超贫金属（UMP）恒星2MASS J20500194-6613298（J2050-6613；[Fe/H] = -4.05），它属于古老的阿塔里圆盘成分。我们利用麦哲伦-克莱望远镜上的 MIKE 摄谱仪获得了这颗恒星的高分辨率光谱。J2050-6613显示出典型的UMP恒星化学丰度模式，包括碳和锌的增强。相比之下，J2050-6613 的[Sr/Fe]和[Sr/Ba]比率与[Fe/H] 1052 erg）中的其他恒星相比极高。如果可能是由中微子驱动的（风）喷出物产生了大量∼10-5 M⊙的Sr，那么这样一颗III类核坍缩超新星可以同时解释2MASS J2050-6613的轻元素和重元素丰度模式的起源。因此，2MASS J2050-6613的丰度模式对阿塔里原生星中最早运行的产生锶的核合成源提供了重要的约束条件。

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来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.