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arXiv 1802.02104astro-ph.GAastro-ph.SR
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Carina复合体中新嵌入团簇的近红外研究

Near-infrared study of new embedded clusters in the Carina complex

R. A. P. Oliveira, E. Bica, C. Bonatto

摘要:

我们分析的性质,我们发现投射在船底座复杂的恒星过密度的样本。本研究以2 MASS测光为基础,对场星进行测光去污,绘制本征色-星等图J $\times$(J-Ks)、色-色图(J-H)$\times$(H-Ks)和径向密度分布图,以确定最佳候选星的结构和主要天体物理参数。作为嵌入式群集的过密度验证需要与PMS内容和MS星(如果有)一致的CMD。从这些结果中,我们能够验证它们是否实际上是嵌入式集群。总体而言,结果是有益的:在101个高密度的样本中,分析提供了15个候选者,其中3个先前被归类为集群(CCCP-Cl $\,$ 16,Treasure Chest和FSR $\,$ 1555),其余12个是提供重要结果的发现,年龄不超过4.5 $\,$ Myr,距离与所研究的复杂。大多数候选者的差异红化值相对较高,证实这些星团仍然(部分或全部)嵌入周围的气体和尘埃中,通常在壳层内。还制作了质量、年龄和距离分布的直方图,以概述结果。我们的结论是,所有12个新发现的嵌入集群有关的隆突复合体。

英文摘要:

We analyse the nature of a sample of stellar overdensities that we found projected on the Carina complex. This study is based on 2MASS photometry and involves the photometry decontamination of field stars, elaboration of intrinsic colour-magnitude diagrams J$\times$(J-Ks), colour-colour diagrams (J-H)$\times$(H-Ks) and radial density profiles, in order to determine the structure and the main astrophysical parameters of the best candidates. The verification of an overdensity as an embedded cluster requires a CMD consistent with a PMS content and MS stars, if any. From these results, we are able to verify if they are, in fact, embedded clusters. The results were, in general, rewarding: in a sample of 101 overdensities, the analysis provided 15 candidates, of which three were previously catalogued as clusters (CCCP-Cl$\,$16, Treasure Chest and FSR$\,$1555), and the 12 remaining are discoveries that provided significant results, with ages not above 4.5$\,$Myr and distances compatible with the studied complex. The resulting values for the differential reddening of most candidates were relatively high, confirming that these clusters are still (partially or fully) embedded in the surrounding gas and dust, as a rule within a shell. Histograms with the distribution of the masses, ages and distances were also produced, to give an overview of the results. We conclude that all the 12 newly found embedded clusters are related to the Carina complex.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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