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arXiv 0908.1041astro-ph.HE
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超巨星快X射线瞬变IGR J17544-2619轨道周期的发现

Discovery of the orbital period in the supergiant fast X-ray transient IGR J17544-2619

D. J. Clark, A. B. Hill, A. J. Bird, V. A. McBride, S. Scaringi, A. J. Dean

摘要:

超巨星快速X射线瞬变(SFXT)系统IGR J17544-2619在过去已经显示了许多大的爆发,被认为是SFXT的典型例子。对MJD 52698-54354的INTEGRAL/ISGRI数据档案的搜索发现了11次爆发,光变曲线的时间分析确定了4.926 $\pm$ 0.001天的周期,我们将其解释为系统的轨道周期。我们发现,大爆发偶尔会发生在近星点之外,并为<23 R $_{\sun}$的超巨星半径设定了上限。

英文摘要:

The supergiant fast X-ray transient (SFXT) system IGR J17544-2619 has displayed many large outbursts in the past and is considered an archetypal example of SFXTs. A search of the INTEGRAL/ISGRI data archive from MJD 52698-54354 has revealed 11 outbursts and timing analysis of the light curve identifies a period of 4.926$\pm$0.001 days which we interpret as the orbital period of the system. We find that large outbursts occasionally occur outside of periastron and place an upper limit for the radius of the supergiant of <23R$_{\sun}$.

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