LMXBs中的硬到软光谱跃迁-受气体再凝结到内部盘的影响
The hard to soft spectral transition in LMXBs - affected by recondensation of gas into an inner disk
摘要：
X射线瞬态源的软、硬谱态反映了吸积的两种模式，即通过几何薄、光学厚的盘吸积或对流主导的吸积流（ADAF）吸积。在这两个状态之间的转换亮度似乎是不同的来源，甚至在不同的爆发，如GX 339-4所观察到的相同的来源。我们研究了硬态中内部弱盘的存在对跃迁光度的影响。我们评估的结构的电晕上方的外部截断磁盘和磁盘蒸发率为不同的照射。在某些情况下，最近对X射线瞬变的观测表明，在硬态期间存在内部冷盘。在最后一次爆发后的平静期，只要光度不降到很低的值（爱丁顿光度的10^-4到10^-3），这样的圆盘就可以保持。因此，由于部分物质通过内盘吸积，硬辐射减少。硬辐射被内盘进一步减弱、遮蔽和部分反射。如果ADAF下方存在内盘，则会导致较低光度下的软硬转变。这似乎得到了GX 339-4观测结果的支持。
英文摘要：
Soft and hard spectral states of X-ray transient sources reflect two modes of accretion, accretion via a geometrically thin, optically thick disk or an advection-dominated accretion flow (ADAF). The luminosity at transition between these two states seems to vary from source to source, or even for the same source during different outbursts, as observed for GX 339-4. We investigate how the existence of an inner weak disk in the hard state affects the transition luminosity. We evaluate the structure of the corona above an outer truncated disk and the resulting disk evaporation rate for different irradiation. In some cases, recent observations of X-ray transients indicate the presence of an inner cool disk during the hard state. Such a disk can remain during quiescence after the last outburst as long as the luminosity does not drop to very low values (10^-4 to 10^-3 of the Eddington luminosity). Consequently, as part of the matter accretes via the inner disk, the hard irradiation is reduced. The hard irradiation is further reduced, occulted and partly reflected by the inner disk. This leads to a hard-soft transition at a lower luminosity if an inner disk exists below the ADAF. This seems to be supported by observations for GX 339-4.
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