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arXiv 1004.0376astro-ph.SR
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天鹅座P星Hα发射风的空间分辨结构

The Spatially Resolved Hα-Emitting Wind Structure of P Cygni

Aurelian Balan, C. Tycner, R. T. Zavala, J. A. Benson, D. J. Hutter, M. Templeton

摘要:

利用海军原型光学干涉仪(NPOI)获得了与亮蓝变星天鹅座P星有关的Hα发射风结构的高空间分辨率观测结果。这些观测是迄今为止天鹅座P星上最全面的干涉测量数据集。我们展示了2005年,2007年和2008年观测季节之间天鹅座P风结构的Hα发射区的表观大小如何比较,以及这与Hα谱线的关系。利用2005年、2007年和2008年观测季的资料,对天鹅座P的Hα辐射风结构的干涉特征进行了圆对称高斯模型拟合。结果表明,天鹅座P附近Hα发射风结构的径向范围稳定在10%水平。我们还展示了来自风结构的Hα通量的径向分布是如何偏离高斯形状的,而双分量高斯模型足以完全描述天鹅座P周围的Hα发射区域。

英文摘要:

High spatial resolution observations of the Hα-emitting wind structure associated with the Luminous Blue Variable star P Cygni were obtained with the Navy Prototype Optical Interferometer (NPOI). These observations represent the most comprehensive interferometric data set on P Cyg to date. We demonstrate how the apparent size of the Hα-emitting region of the wind structure of P Cyg compares between the 2005, 2007 and 2008 observing seasons and how this relates to the Hαline spectroscopy. Using the data sets from 2005, 2007 and 2008 observing seasons, we fit a circularly symmetric Gaussian model to the interferometric signature from the Hα-emitting wind structure of P Cyg. Based on our results we conclude that the radial extent of the Hα-emitting wind structure around P Cyg is stable at the 10% level. We also show how the radial distribution of the Hαflux from the wind structure deviates from a Gaussian shape, whereas a two-component Gaussian model is sufficient to fully describe the Hα-emitting region around P Cyg.

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