About the nature of Mercer 14 About the nature of Mercer 14
About the nature of Mercer 14 About the nature of Mercer 14
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关于美世的本质 14 关于美世的本质 14
DOI：
10.1111/j.1365-2966.2011.19589.x
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发表时间：
2011
影响因子：
4.8
通讯作者：
Froebrich D
中科院分区：
文献类型：
--
作者：
Froebrich D
我们利用英国红外望远镜（UKIRT）近红外（NIR）宽带jhkphotometry， 1-0 S(1)分子氢发射线的窄带成像和中红外spitzerirac数据来研究年轻星团Mercer 14的性质。利用去污近红外光度法计算前景恒星数，并与贝桑松星系模型进行比较，估计星团距离。该方法产生的距离为2.5 kpc，不确定度约为10%，可以应用于其他年轻和嵌入式簇。Mercer 14显示出正在进行的恒星形成的清晰迹象，有几个探测到的氢分子外流，红外过量源的高比例，以及与一个小气体和尘埃云的关联。因此，该星团的年龄小于4myr，视距消光为ak = 0.8等。根据最大质量的星团成员，我们发现Mercer 14是一个中等质量的星团，质量约为500m⊙。
We used UK Infrared Telescope (UKIRT) near-infrared (NIR) broad-bandJHKphotometry, narrow band imaging of the 1-0 S(1) molecular hydrogen emission line and mid-infraredSpitzerIRAC data to investigate the nature of the young cluster Mercer 14. Foreground star counts in decontaminated NIR photometry and a comparison with the Besancon Galaxy Model are performed to estimate the cluster distance. This method yields a distance of 2.5 kpc with an uncertainty of about 10 per cent and can be applied to other young and embedded clusters. Mercer 14 shows clear signs of ongoing star formation with several detected molecular hydrogen outflows, a high fraction of infrared excess sources and an association to a small gas and dust cloud. Hence, the cluster is less than 4 Myr old and has a line-of-sight extinction ofAK= 0.8 mag. Based on the most massive cluster members we find that Mercer 14 is an intermediate mass cluster with about 500 M⊙.