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arXiv 1606.01958astro-ph.SRastro-ph.GA
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船底座区域的恒星星族:l = 291的银河平面

Stellar populations in the Carina region: The Galactic plane at l = 291

J. A. Molina-Lera, G. Baume, R. Gamen, E. Costa, G. Carraro

摘要:

以前对船底座区域的研究揭示了它的复杂性和丰富性,以及大量的早期类型恒星。在许多情况下,这些研究仅集中在中心区域或不均匀。后一个方面尤其重要,因为近年来人们声称关键星团的年龄和距离非常不同。这项工作的目的是详细研究船底座的银河平面区域。我们分析了不同的恒星星族的性质,并集中在一个样本的疏散星团和他们的人口YSO和高度红化的早期恒星。我们还研究了这些星团中恒星的质量分布和它们形成的可能情况。最后,我们在这个方向上概述了银河系的螺旋结构。我们获得了位于船底座l = 291的六个年轻疏散星团及其邻近恒星场的光度数据,并对一些选定的目标进行了光谱观测。我们还从文献中挑选了额外的信息。我们的结果提供了更可靠的估计距离,颜色过剩,质量和年龄的恒星星族在这个方向。我们估计的基本参数的研究集群,发现他们确定两个超密度的年轻恒星星族。我们在其中发现了PMS种群的证据,在最显眼的星团中有明显的同时代恒星形成。我们还讨论了在NW-SE方向上的表观年龄和距离梯度。我们研究了几个集团在该地区的质量分布。它们始终显示出典型的IMF斜率。我们发现并确认了一个异常变红的大质量恒星星族。对后一种星族中的10颗恒星的光谱观测表明,所有被选中的目标都是大质量OB星。它们的位置与Car-Sag螺旋臂的位置一致。

英文摘要:

Previous studies of the Carina region have revealed its complexity and richness as well as a significant number of early-type stars. In many cases, these studies only concentrated on the central region or were not homogeneous. This latter aspect, in particular, is crucial because very different ages and distances for key clusters have been claimed in recent years. The aim of this work is to study in detail an area of the Galactic plane in Carina. We analyze the properties of different stellar populations and focus on a sample of open clusters and their population of YSOs and highly reddened early stars. We also studied the stellar mass distribution in these clusters and the possible scenario of their formation. Finally, we outline the Galactic spiral structure in this direction. We obtained photometric data for six young open clusters located in Carina at l = 291, and their adjacent stellar fields, which we complemented with spectroscopic observations of a few selected targets. We also culled additional information from the literature. Our results provide more reliable estimates of distances, color excesses, masses, and ages of the stellar populations in this direction. We estimate the basic parameters of the studied clusters and find that they identify two overdensities of young stellar populations. We find evidence of PMS populations inside them, with an apparent coeval stellar formation in the most conspicuous clusters. We also discuss apparent age and distance gradients in the direction NW-SE. We study the mass distributions of several clusters in the region. They consistently show a canonical IMF slope. We discover and characterise an abnormally reddened massive stellar population. Spectroscopic observations of ten stars of this latter population show that all selected targets were massive OB stars. Their location is consistent with the position of the Car-Sag spiral arm.

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