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arXiv 1004.0399astro-ph.GA
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斯皮策太空望远镜发现的具有星周壳的大质量恒星的隐藏种群

A Hidden Population of Massive Stars with Circumstellar Shells Discovered with the Spitzer Space Telescope

S. Wachter, J. C. Mauerhan, S. D. Van Dyk, D. W. Hoard, S. Kafka, P. W. Morris

备注：
23 pages, 9 figures, accepted for publication in AJ
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摘要：

我们已经发现了大量的圆形和椭圆形壳在24微米周围的发光中心源与MIPS仪器上的斯皮策太空望远镜。我们的档案后续工作揭示了这些拱星壳的90%是以前未知的。大部分的壳层只能在24微米处可见，但许多中心恒星可以在中红外到近红外的多个波长处被探测到。然而，普遍缺乏光学对应物表明，这些来源代表了一群高度模糊的物体。我们对中心恒星进行了光学和近红外光谱观测，发现这些天体大多是大质量恒星。特别是，我们确定了大量的来源，我们认为代表了一个狭窄的演化阶段，密切相关或相同的大规模恒星演化的LBV阶段。

英文摘要：

We have discovered a large number of circular and elliptical shells at 24 microns around luminous central sources with the MIPS instrument on-board the Spitzer Space Telescope. Our archival follow-up effort has revealed 90% of these circumstellar shells to be previously unknown. The majority of the shells is only visible at 24 microns, but many of the central stars are detected at multiple wavelengths from the mid- to the near-IR regime. The general lack of optical counterparts, however, indicates that these sources represent a population of highly obscured objects. We obtained optical and near-IR spectroscopic observations of the central stars and find most of these objects to be massive stars. In particular, we identify a large population of sources that we argue represents a narrow evolutionary phase, closely related or identical to the LBV stage of massive stellar evolution.

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