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arXiv 0910.5603astro-ph.SR
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高质量X射线双星候选者的近红外测量

Near-infrared survey of High Mass X-ray Binary candidates

J. M. Torrejón, I. Negueruela, D. M. Smith, T. E. Harrison

摘要:

我们将I、J、H和K波段的红外光谱与JHK测光结合起来,对五个积分源的光谱类型、光度级和到红外对应物的距离进行了表征。对于SAX J18186-1703和IGR J18483-0311,我们提出了第一个中等分辨率光谱报告。我们发现,四个系统的港口早B型超巨星。它们都被严重遮蔽,E(B-V)介于3到5之间,意味着视觉上的距离约为9到15等。我们通过约束其光度类别来改进IGR J18027-2016和IGR J19140+0951的已发表分类。在第一种情况下,我们确认了超巨星的性质,并排除了III类。在第二种情况下,我们提出了一个稍高的光度类(Ia而不是Iab),并给出了一个改进的值的距离的基础上新的光学测光。IGR J18027-2016和IGR J19140+0951具有红外和X射线特征,是超巨星X射线双星,其X射线亮度约为Lx ~ [1-2] x 10^{36} erg/s,而SAX J1818.6-1703和IGR J18483-0311是超巨星快X射线瞬变,其亮度约为2和3 kpc,分别最后,XTE J1901+014成为一个令人困惑的来源:它的X射线行为强烈地让人联想到SFXTs,但它的超巨星性质被坚定地排除了。我们讨论了几种替代方案来解释其行为。

英文摘要:

We combine infrared spectra in the I, J, H and K bands together with JHK photometry to characterize the spectral type, luminosity class and distance to the infrared counterparts to five INTEGRAL sources. For SAX J18186-1703 and IGR J18483-0311, we present the first intermediate-resolution spectroscopy reported. We find that four systems harbour early-type B supergiants. All of them are heavily obscured, with E(B-V) ranging between 3 and 5, implying visual extinctions of ~ 9 to 15 magnitudes. We refine the published classifications of IGR J18027-2016 and IGR J19140+0951 by constraining their luminosity class. In the first case, we confirm the supergiant nature and rule out class III. In the second case, we propose a slightly higher luminosity class (Ia instead of Iab) and give an improved value of the distance based on new optical photometry. Owing to their infrared and X-ray characteristics, IGR J18027-2016 and IGR J19140+0951, emerge as Supergiant X-ray binaries with X-ray luminosities of the order of Lx ~ [1-2] x 10^{36} erg/s, while SAX J1818.6-1703 and IGR J18483-0311, turn out to be Supergiant Fast X-ray Transients at 2 and 3 kpc, respectively. Finally, XTE J1901+014 emerges as a puzzling source: its X-ray behaviour is strongly reminiscent of the SFXTs but a supergiant nature is firmly ruled out for the counterpart. We discuss several alternative scenarios to explain its behaviour.

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