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arXiv 1111.1454astro-ph.SR
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海山二原始风与一个世纪前赤道慢喷发物的相互作用

The Interaction of the Eta Carinae Primary Wind with a Century Old Slow Equatorial Ejecta

Noam Soker, Amit Kashi

摘要:

我们认为,蓝移和红移成分的流出在数百个AU的大规模的双星系统船底座伊塔的不对称形态可以理解的碰撞的主要恒星风与缓慢膨胀的密集赤道气体。最近对一些禁谱线的高空间观测,例如[Fe III] Aldida 4659,揭示了从Eta Car流出的气体在大约1弧秒(2300 AU)内。蓝移和红移分量的分布是关于中心不对称的,并且它们彼此有很大的不同。蓝移和红移成分的形态与密集的缓慢移动的赤道气体(称为Weigelt blob环境; WBE)的位置相关,这被认为是在1887 - 1895年的小喷发期间喷出的。在我们的模式中,蓝移和红移分量的划分是由主风与西半球边界层碰撞后在赤道面两侧的激波后气流引起的。来自次级恒星的快速风在我们的模型中对这些成分没有作用,它是自由膨胀的主风与WBE碰撞。因为视线倾斜于双星轴,所以两个分量不对称。我们表明,激波后气体也可以解释观测到的强度在[Fe III]的A4659线。

英文摘要:

We argue that the asymmetric morphology of the blue and red shifted components of the outflow at hundreds of AU from the massive binary system Eta Carinae can be understood from the collision of the primary stellar wind with the slowly expanding dense equatorial gas. Recent high spatial observations of some forbidden lines, e.g. [Fe III] lambda4659, reveal the outflowing gas within about one arcsecond (2300 AU) from Eta Car. The distribution of the blue and red shifted components are not symmetric about the center, and they are quite different from each other. The morphologies of the blue and red shifted components correlate with the location of dense slowly moving equatorial gas (termed the Weigelt blob environment; WBE), that is thought to have been ejected during the 1887 - 1895 Lesser Eruption. In our model the division to the blue and red shifted components is caused by the postshock flow of the primary wind on the two sides of the equatorial plane after it collides with the WBE. The fast wind from the secondary star plays no role in our model for these components, and it is the freely expanding primary wind that collides with the WBE. Because the line of sight is inclined to the binary axis, the two components are not symmetric. We show that the postshock gas can also account for the observed intensity in the [Fe III] lambda4659 line.

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