论文标题
小型麦哲伦云田间星星干预星团年龄估计
Small Magellanic Cloud field stars meddling in star cluster age estimates
论文作者
论文摘要
我重新审视了小型麦哲伦云集群HW 42的年龄，其先前的估计在6个以上的GYR中有所不同，因此挑战了SMC星形成历史的最新知识。我对不同亮度水平的数字恒星密度曲线进行了分析。进行了集群颜色磁性图的田间恒星去污染；并通过最小化可能性函数的最小化及其不确定性来估计群集基本参数。我得出的结论是，HW 42是6.2 $^{\ rm +1.6} _ {\ rm -1.3} $ gyr Old（[[Fe/H] = -0.89 $^{\ rm +0.10} _ {\ rm -0.11}主序列恒星的恒星密度。目前的结果解决了以前的年龄差异的难题，并将HW〜42移至SMC年龄 - 金属关系中的一个区域。
I revisited the age of the Small Magellanic Cloud cluster HW 42, whose previous estimates differ in more than 6 Gyr, thus challenging the most updated knowledge of the SMC star formation history. I performed an analysis of number stellar density profiles at different brightness levels; carried out a field star decontamination of the cluster color-magnitude diagram; and estimated the cluster fundamental parameters from the minimization of likelihood functions and their uncertainties from standard bootstrap methods. I conclude that HW 42 is a 6.2$^{\rm +1.6}_{\rm -1.3}$ Gyr old ([Fe/H] = -0.89$^{\rm +0.10}_{\rm -0.11}$ dex) SMC cluster projected on to a SMC composite star field population which shows variations in magnitude, color, and stellar density of Main Sequence stars. The present outcome solves the conundrum of the previous age discrepancies and moves HW~42 to a region in the SMC age-metallicity relationship populated by star clusters.
