盖亚告诉我们的太阳附近的恒星形成历史

J. A. Alzate, G. Bruzual, D. J. Díaz-González
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引用次数: 8

摘要

盖亚DR2星表是目前最好的恒星天文测量和光度测量数据来源。银河系的历史在这个数据集中被刻在石头上。视差和光度测量告诉我们恒星今天的位置,它们是什么时候形成的,以及它们的化学成分,即它们的恒星形成历史(SFH)。我们开发了一个贝叶斯层次模型,适合重建一个已解决的恒星群的SFH。我们研究了Gaia DR2中距离太阳100pc内亮度大于$G\,=\,15$的恒星,得出了与先前测定一致的太阳邻域的SFH,并在此基础上进行了改进,因为我们发现了化学富集。我们的研究结果表明,在10 Gyr之前,恒星形成活动达到最大值,产生了大量的恒星,其金属丰度略低于太阳(Z=0.014),随后在8 Gyr之前,恒星形成活动减少到最低水平。经过一段安静期后,恒星形成在大约5gyr前达到最大值,形成了金属丰度(Z=0.017)与太阳相似的恒星。最后,恒星的形成一直在减少,直到现在,在残余水平上形成Z=0.03的恒星。我们通过忽略样品中未解析双星的存在、降低视极限星等和修改恒星初始质量函数来测试SFH所带来的影响。
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Star formation history of the solar neighbourhood as told by Gaia
The Gaia DR2 catalog is the best source of stellar astrometric and photometric data available today. The history of the Milky Way galaxy is written in stone in this data set. Parallaxes and photometry tell us where the stars are today, when were they formed, and with what chemical content, i.e. their star formation history (SFH). We develop a Bayesian hierarchical model suited to reconstruct the SFH of a resolved stellar population. We study the stars brighter than $G\,=\,15$ within 100 pc of the Sun in Gaia DR2 and derive a SFH of the solar neighbourhood in agreement with previous determinations and improving upon them because we detect chemical enrichment. Our results show a maximum of star formation activity about 10 Gyr ago, producing large numbers of stars with slightly below solar metallicity (Z=0.014), followed by a decrease in star formation up to a minimum level occurring around 8 Gyr ago. After a quiet period, star formation rises to a maximum at about 5 Gyr ago, forming stars of solar metallicity (Z=0.017). Finally, star formation has been decreasing until the present, forming stars of Z=0.03 at a residual level. We test the effects introduced in the inferred SFH by ignoring the presence of unresolved binary stars in the sample, reducing the apparent limiting magnitude, and modifying the stellar initial mass function.
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