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INTERSTELLAR EXTINCTION IN THE DIRECTION OF THE OPEN CLUSTER M29

机译:星际消隐在开放集群M29的方向上

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The interstellar extinction is investigated in a 1.5 deg2 area in the direction of the open cluster M29 (NGC 6913) in Cygnus, centered at R.A. = 20h 24m, decl. = +38° 30'. The study is based on photometric classification of 1110 stars in spectral and luminosity classes down to V = 19 mag using photometry in the Vilnius seven-color system published in Paper I (Mila?ius et al. 2013). Additionally, in the same area the extinction is investigated using 1147 red clump giants (RCGs), identified by combining selected two-color diagrams of the 2MASS and Spitzer surveys. The investigated area is divided into three parts with different obscuration and in these directions the extinction versus distance plots up to 5 kpc are presented. In the whole area a steep rise of the extinction is observed at a distance of ~800 pc; it should be related to dust clouds in the Great Cygnus Rift obscuring the stars behind it by AV = 4.0–4.7 mag. RCGs exhibit much larger extinction values, up to = 1.2–1.3 mag in the more transparent areas and 1.45 mag in the northeastern part of the area and above it, where the dust cloud TGU H466 is located. These values of correspond to AV = 10–12 mag. We do not exclude the possibility that the largest values of the extinction belong not to RCGs but to some contaminating intrinsically red AGB stars penetrated through the applied RCG selection constraints. The extinction in the TGU H466 cloud probably originates in two cloud systems—the Great Cygnus Rift at 800 pc and the Cygnus X complex of dust and molecular clouds at 1.3–1.5 kpc.
机译:在天鹅座中以R.A为中心的开放星团M29(NGC 6913)的方向上,在1.5度2面积内研究了星际灭绝。 = 20h 24m,默认= + 38°30'。该研究基于在论文I(Mila?ius等人,2013年)上发表的维尔纽斯七色系统中使用光度法对1110颗恒星的光谱学和光度学类别进行了分类,光谱级和光度低至V = 19 mag。此外,在同一地区,使用1147个红色丛状巨人(RCG)对灭绝现象进行了调查,通过结合选择的2MASS和Spitzer调查的两个彩色图表进行识别。研究区域分为三部分,具有不同的遮盖力,并在这些方向上显示了最大5 kpc的消光距离图。在整个区域,在约800 pc的距离处观察到了物种灭绝的急剧上升。它应该与大天鹅裂谷中的尘埃云有关,其AV = 4.0–4.7 mag遮盖了它后面的恒星。 RCGs的消光值更大,在更透明的区域中最大= 1.2–1.3 mag,在该区域东北部及其上方(尘云TGU H466所在的区域)高达1.45 mag。这些值对应于AV = 10–12 mag。我们不排除灭绝的最大值不属于RCG的可能性,而是属于通过应用的RCG选择约束穿透的一些污染性内在红色AGB恒星的可能性。 TGU H466云的灭绝可能起源于两个云系统-800 pc的大天鹅座裂谷和1.3-1.5 kpc的尘埃和分子云的天鹅座X复合体。

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