论文标题
延长的Carina星云综合体中年轻恒星簇的Gaia EDR3距离
Gaia EDR3 distances of the young stellar clusters in the extended Carina Nebula complex
论文作者
论文摘要
上下文：Carina Nebula综合体（CNC）是我们银河系中最庞大，最活跃的星形形成区域之一，它包含几个大型的年轻恒星簇。到目前为止，各个集群的距离及其物理联系鲜为人知，文献中报告了强烈的差异结果。目的：我们要确定中部嘉年华星云区（尤其是TR 14、15和16）的年轻恒星簇的可靠距离，以及在CNC西北外围的著名群集NGC 3324和NGC 3293。方法：我们分析了GAIA EDR3中的视差，以全面鉴定出237个光谱鉴定的OB恒星，以及整个综合体中的9562 X射线选择的年轻恒星。我们还进行了一个天文分析，以识别位于卡琳娜星云西北部的前景中的年轻群集VDBH 99的成员。结果：我们发现，CNC中研究的簇的距离在<= 2％之内相等，并且非常可能的OB星样品的平均距离值为2.36（+0.05 -0.05）KPC，为2.34（+0.0.05 -05 -0.06）KPC的X射线选择年轻星星的样品的平均距离值。结论：我们的结果表明，CNC中的簇构成了一个连贯的恒星形成区域，尤其是关于NGC 3324和NGC 3293在西北外围的NGC 3293，该区域（在与中央Carina Nebula相同的距离内）（<= 2％）。对于前景群集VDBH 99，我们发现平均距离为441（+2 -2）PC，年龄约为60 MYR。我们根据该前景集群的成员量化了X射线固定的X射线固定样品的污染。
Context: The Carina Nebula complex (CNC) is one of the most massive and active star-forming regions in our Galaxy and it contains several large young star clusters. The distances of the individual clusters and their physical connection were poorly known up to now, with strongly discrepant results reported in the literature. Aims: We want to determine reliable distances of the young stellar clusters in the central Carina Nebula region (in particular, Tr 14, 15, and 16) and the prominent clusters NGC 3324 and NGC 3293 in the northwestern periphery of the CNC. Methods: We analyzed the parallaxes in Gaia EDR3 for a comprehensive sample of 237 spectroscopically identified OB stars, as well as for 9562 X-ray-selected young stars throughout the complex. We also performed an astrometric analysis to identify members of the young cluster vdBH 99, which is located in the foreground of the northwestern part of the Carina Nebula. Results: We find that the distances of the investigated clusters in the CNC are equal within <= 2%, and yield very consistent most likely mean distance values of 2.36(+0.05 -0.05) kpc for the OB star sample and 2.34(+0.05 -0.06) kpc for the sample of X-ray-selected young stars. Conclusions: Our results show that the clusters in the CNC constitute a coherent star-forming region, in particular with regard to NGC 3324 and NGC 3293 at the northwestern periphery, which are (within <= 2%) at the same distance as the central Carina Nebula. For the foreground cluster vdBH 99, we find a mean distance of 441(+2 -2) pc and an age of ~ 60 Myr. We quantified the contamination of X-ray-selected samples of Carina Nebula stars based on members of this foreground cluster.
