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arXiv 0912.0925astro-ph.GA
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HD211564周围环状星云的射电和IR对应物

The radio and IR counterparts of the ring nebula around HD211564

C. Cappa, J. Vasquez, S. Pineault, S. Cichowolski

摘要:

我们报告了在位于HII区Sh 2132西南方的WN 3(h)星HD211564(WR 152)周围的环形星云的射电和红外对应物的探测。利用加拿大银道面巡天的射电连续谱数据,我们确定了与这颗恒星有关的两个半径分别为9'和16'的同心环的射电对应物。在应用填充因子f = 0.05-0.12后,电子密度和电离质量分别在10-16 cm^-3和450-700 Mo范围内。通过分析HI气体的发射分布,可以确定5900 Mo的中性原子气体,其速度在-52和-43 km/s之间,可能与星云有关。星云的区域几乎没有分子气体。仅检测到四个小团块,总分子量为790 Mo。大约310 Mo与一个与内环相连的小型红外贝壳状源有关,该源也在MSX带A中被探测到。一个IRAS YSO候选者与壳状红外源一致被探测到。我们认为光学星云和它的中性对应物起源于WR星及其大质量祖先的星风,并在一个缓慢膨胀的壳层的包层中演化,该壳层的中心位置为(l,b)=(102 30,-0 50),半径约为31 pc。气泡的能量转换效率与最近的数值分析和观测结果一致。

英文摘要:

We report the detection of the radio and infrared counterparts of the ring nebula around the WN3(h) star HD211564 (WR152), located to the southwest of the HII region Sh2132. Using radio continuum data from the Canadian Galactic Plane Survey, we identified the radio counterparts of the two concentric rings, of about 9' and 16' in radius, related to the star. After applying a filling factor f = 0.05-0.12, electron densities and ionized masses are in the range 10-16 cm^-3 and 450-700 Mo, respectively. The analysis of the HI gas emission distribution allowed the identification of 5900 Mo of neutral atomic gas with velocities between -52 and -43 km/s probably linked to the nebula. The region of the nebula is almost free of molecular gas. Only four small clumps were detected, with a total molecular mass of 790 Mo. About 310 Mo are related to a small infrared shell-like source linked to the inner ring, which is also detected in the MSX band A. An IRAS YSO candidate is detected in coincidence with the shell-like IR source. We suggest that the optical nebula and its neutral counterparts originated from the stellar winds from the WR star and its massive progenitor, and are evolving in the envelope of a slowly expanding shell centered at (l,b) = (102 30, -0 50), of about 31 pc in radius. The bubble's energy conversion efficiency is in agreement with recent numerical analysis and with observational results.

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