Leaky-wave-induced disks around Be star: a pulsational analysis on their formation
Leaky-wave-induced disks around Be star: a pulsational analysis on their formation
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Be 星周围漏波诱发盘：对其形成的脉动分析
DOI：
10.1017/s1743921314006760
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M.-A.
中科院分区：
文献类型：
--
作者：
Godart;M.;Shibahashi;H.;Dupret;M.-A.
Be星是主序附近的b型恒星，它们经历了由发射谱线探测到的偶发性质量损失事件，其谱线的形状和强度随几十年量级的时间尺度而变化。光谱观测显示了一个很大的旋转速度，以至于赤道盘形成的一个普遍的情况是赤道旋转速度增加到分裂极限，在那里重力受到离心力的挑战。我们在此研究了Ishimatsu & Shibahashi（2013）最近提出的一种新情况，其中角动量通过光球的传输将通过漏波实现，使旋转速度仍然低于破裂极限。
Be stars are B-type stars near the main sequence which undergo episodic mass loss events detected by emission lines, whose line shape and intensity vary with a timescale of the order of decades. Spectroscopic observations show a large rotation velocity such that one of the prevailing scenarios for the formation of the equatorial disk consists in an increasing equatorial rotation velocity to the break-up limit where gravity is challenged by the centrifugal force. We investigate here a new scenario recently suggested by Ishimatsu & Shibahashi (2013), in which the transport of angular momentum through the photosphere would be achieved by leaky waves, keeping the rotation velocity still below the break-up limit.