ORBITAL PERIOD AND OUTBURST LUMINOSITY OF TRANSIENT LOW MASS X-RAY BINARIES

ORBITAL PERIOD AND OUTBURST LUMINOSITY OF TRANSIENT LOW MASS X-RAY BINARIES
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瞬态低质量X射线双星的轨道周期和爆发光度

DOI:
10.1088/0004-637x/718/2/620
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发表时间:
2010-06
影响因子:
4.9
通讯作者:
Li, X. D.
Li, X. D.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu, Y. X.;Yu, W.;Li, T. P.;Maccarone, T. J.;Li, X. D.

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本文研究了近十年来Rossi X射线定时探测器(RXTE)观测到的低质量瞬变X射线双星(或称软X射线瞬变)中X射线爆发的最大亮度与轨道周期之间的关系。我们发现,爱丁顿单位的最大光度(3-200 keV)一般随着轨道周期的增加而增加,这并没有显示出光度饱和,但在一般情况下与理论预测一致。超紧凑双星的峰值亮度可能高于轨道周期为2-4小时的双星,但需要更多的数据来证明这一点。我们还发现,有没有显着的差异,在3-200 keV的峰值爆发光度中子星星(NS)系统和黑洞(BH)系统的轨道周期大于4小时之间,但是,可能有一个显着的差异,在较小的轨道周期,只有NS系统被观察到,辐射效率低的吸积流预计将工作在低光度的BH吸积。
In this paper, we investigate the relationship between the maximal luminosity of X-ray outburst and the orbital period in transient low mass X-ray binaries (or soft X-ray transients) observed by the Rossi X-ray Timing Explorer (RXTE) in the past decade. We find that the maximal luminosity (3–200 keV) in Eddington units generally increases with increasing orbital period, which does not show a luminosity saturation but in general agrees with theoretical prediction. The peak luminosities in ultra-compact binaries might be higher than those with an orbital period of 2–4 hr, but more data are needed to make this claim. We also find that there is no significant difference in the 3–200 keV peak outburst luminosity between neutron star (NS) systems and black hole (BH) systems with orbital periods above 4 hr; however, there might be a significant difference at smaller orbital periods where only NS systems are observed and radiatively inefficient accretion flow is expected to work at low luminosities for BH accreters.
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