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arXiv 1006.3333astro-ph.SR
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船底座η双星系统中引力在风碰撞中的作用

The Role of Gravity in Winds Collision in the eta Carinae Binary System

Muhammad Akashi, Noam Soker

摘要:

我们对船底座伊塔双星系统中的风碰撞过程进行了三维数值模拟,得出了近星通过过程中发生吸积的结论。我们包括辐射冷却的两个风,一个从每一个恒星,和重力的次要和主要恒星。我们新的数值结果是,在轨道间距约3-4AU,大约三个星期前,近星点通过,吸积致密的初级风气体到二级恒星开始。为了分离次级恒星引力的基本作用,我们忽略了初级风的轨道运动和加速区。包括这些影响将进一步加强我们的结论,即Eta Car的近星点通道附近的吸积是不可避免的。主风气体在近星点附近的几个星期内吸积到副星上,这解释了双星系统在近星点附近令人困惑的行为。

英文摘要:

We conduct 3D numerical simulations of the winds collision process in the massive binary system Eta Carinae, and conclude that accretion occurs during periastron passage. We include radiative cooling of the two winds, one from each star, and the gravity of the secondary and primary stars. Our new numerical finding is that at an orbital separation of ~3-4AU, about three weeks before periastron passage, accretion of dense primary wind gas onto the secondary star begins. To isolate the basic role of the secondary stellar gravity, we neglect the orbital motion and the acceleration zone of the primary wind. Including these effects will strengthen even more our conclusion that accretion near periastron passage of Eta Car is inevitable. Accretion of the primary wind gas onto the secondary star for several weeks near periastron passage accounts for the otherwise puzzling behavior of the binary system near periastron passage.

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