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arXiv 1503.05942astro-ph.SRastro-ph.GA
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M83的红外质量恒星含量

The Infrared Massive Stellar Content of M83

S. J. Williams, A. Z. Bonanos, B. C. Whitmore, J. L. Prieto, W. P. Blair

摘要:

我们提出了一个档案斯皮策图像和新的地面和哈勃太空望远镜(HST)的近红外(IR)和光学图像的M83领域的识别稀有,尘埃,进化的大质量恒星的目标进行分析。我们目前的点源目录包括3778个对象从$Spitzer$红外阵列相机(IRAC)波段1(3.6 $μ$ m)和波段2(4.5 $μ$ m),975个对象中确定的麦哲伦6.5米四星近红外$J$和$K_{\rm s}$图像。一个坐标匹配的近红外和中红外点源的组合目录在M83的领域中产生了221个物体。使用这种测光,我们确定185大规模的演变恒星候选人的基础上,他们的位置在颜色-星等和颜色-颜色图。我们估计我们的恒星候选名单的背景污染,并进一步分类的基础上,它们的外观在$HST$宽视场相机3(WFC 3)的观测M83的候选人。我们发现了49个强有力的候选者,大质量恒星是非常有前途的光谱后续对象。根据它们在$B-V$与$V-I$图中的位置,我们预计至少有24颗,或大约50%的,被证实是红超巨星。

英文摘要:

We present an analysis of archival Spitzer images and new ground-based and Hubble Space Telescope (HST) near-infrared (IR) and optical images of the field of M83 with the goal of identifying rare, dusty, evolved massive stars. We present point source catalogs consisting of 3778 objects from $Spitzer$ Infrared Array Camera (IRAC) Band 1 (3.6 $μ$m) and Band 2 (4.5 $μ$m), and 975 objects identified in Magellan 6.5m FourStar near-IR $J$ and $K_{\rm s}$ images. A combined catalog of coordinate matched near- and mid-IR point sources yields 221 objects in the field of M83. Using this photometry we identify 185 massive evolved stellar candidates based on their location in color-magnitude and color-color diagrams. We estimate the background contamination to our stellar candidate lists and further classify candidates based on their appearance in $HST$ Wide Field Camera 3 (WFC3) observations of M83. We find 49 strong candidates for massive stars which are very promising objects for spectroscopic follow-up. Based on their location in a $B-V$ versus $V-I$ diagram, we expect at least 24, or roughly 50%, to be confirmed as red supergiants.

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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