Atari盘分量中的一颗富锶超贫金属星
A Strontium-rich Ultra Metal-poor Star in the Atari Disk Component
AI总结：
发现首颗属于Atari盘分量的超贫金属星J2050$-$6613，其极高[Sr/Fe]和[Sr/Ba]比值表明早期第三族超新星核合成产生了大量锶，为锶起源提供关键约束。
摘要：
我们报告发现了第一颗属于古老Atari盘分量的超贫金属（UMP）星2MASS~J20500194$-$6613298（J2050$-$6613；[Fe/H] = $-4.05$），该星是从Gaia BP/RP光谱星表中选出的。我们使用麦哲伦-克莱望远镜上的MIKE摄谱仪获取了该星的高分辨率光谱。J2050$-$6613显示出典型的UMP星化学丰度模式，包括碳和锌的增强。相比之下，在[Fe/H] $<-4.0$的恒星中，J2050$-$6613显示出极高的[Sr/Fe]和[Sr/Ba]比值。J2050$-$6613很可能是一颗早期第二族恒星，由被一颗大质量第三族超新星（E $> 10^{52}$ 尔格）化学增丰的气体云形成。如果产生了大量约$10^{-5}$太阳质量的锶（可能由中微子驱动的（风）喷射物产生），这种第三族核心坍缩超新星可以同时解释2MASS~J2050$-$6613轻元素和重元素丰度模式的起源。因此，2MASS~J2050$-$6613的丰度模式对最早时期Atari前身星中产生锶的核合成来源施加了重要约束。
英文摘要：
We report on the discovery of the first ultra metal-poor (UMP) star 2MASS~J20500194$-$6613298 (J2050$-$6613; \mbox{[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 $> 10^{52}$\,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 $\sim10^{-5}$\,M$_{\odot}$ was produced, possibly by neutrino-driven \textbf{(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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