arXiv 0904.28402009-04astro-ph.SR

用吸积模型解释Eta Carinae从2009年X射线极小期提前退出

Explaining the Early Exit of Eta Carinae from its 2009 X-Ray Minimum with the Accretion Model

Amit Kashi, Noam Soker

备注：: ApJ Letters, 5 pages, 1 figure
发表信息：: Astrophys.J.701:L59-L62,2009
DOI：: 10.1088/0004-637X/701/1/L59

摘要：

我们使用吸积模型来解释早期退出的海山二从2009年的X射线最低。在吸积模型中，次级恒星在近星点附近吸积来自主风的质量，这是一个抑制次级风的过程。由于激波次级风是造成大部分X射线发射的原因，吸积过程是造成X射线最小值的原因。2009年X射线最低值出现4周后就提前结束，而不是前两次最低值出现的10周，这是因为上一次最低值出现的主要风比前两次X射线最低值出现的速度更快，质量损失率也更低。这导致在X射线最小值期间的质量吸积率低得多。我们表明，使用这些量的波动范围内推导出的最小值以外的X射线通量的波动，可以占最后X射线最小的持续时间短。较短的X射线最小值可能对系统从光谱事件中的恢复有进一步的影响。

英文摘要：

We use the accretion model to explain the early exit of Eta Carinae from its 2009 X-ray minimum. In the accretion model the secondary star accretes mass from the primary wind near periastron passage, a process that suppresses the secondary wind. As the shocked secondary wind is responsible for most of the X-ray emission, the accretion process accounts for the X-ray minimum. The early exit from the 2009 X-ray minimum after four weeks, instead of ten weeks as in the two previous minima, is attributed to the primary wind that during the last minimum was somewhat faster and of lower mass loss rate than during the two previous X-ray minima. This results in a much lower mass accretion rate during the X-ray minimum. We show that using fluctuations in these quantities that are within the range deduced from fluctuations in the X-ray flux outside the minimum, can account for the short duration of the last X-ray minimum. The shorter X-ray minimum may have further implications on the recovery of the system from the spectroscopic event.

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