天文学进展2012，Vol.30Issue(3)：316-333,18.
非稳态吸积主导X射线双星从硬态到软态的态跃迁
Hard-to-soft State Transition Dominated by Non-stationary Accretion
摘要
Abstract
Different states of X-ray binaries are defined according to some observational features such as X-ray spectra and timing variabilities. The theory based on the stationary accretion was used to explain different states and state transitions, but there is a gap between the theories and observations. Some new studies show that non-stationary accretion determined the luminosity of the hard-to-soft state transition. A positive correlation between the luminosity of the hard-to-soft state transition and the peak luminosity of the following soft state was found in some X-ray binaries, and then a statistical study about the sate transition luminosity showed that transient and persistent X-ray binaries follow the same positive correlation. Another positive correlation between the luminosity of the hard-to-soft state.transition and the rate-of-increase of luminosity was found. These two empirical cor-relations suggest that the hard-to-soft state transition is dominated by the non-stationary accretion which is characterized by the rate of increase of the mass accretion rate. There is a unique correlation between the peak flux in the hard X-ray and the outburst waiting time in GX 339-4, implying that the peak flux in the hard X-ray is determined by the mass accumulated before the outburst. On the other hand the statistical study about the peak luminosity of outbursts in LMXB transients showed that the peak luminosities of outbursts positively correlate with the orbital periods, which also supports that the peak luminosity is determined by the disk mass. These results suggest that the non-stationary accretion in outbursts/flares is set up by the initial condition - disk mass.关键词
吸积盘/黑洞/X射线双星Key words
accretion disks/ black hole/ X-ray binaries分类
天文与地球科学引用本文复制引用
闫震..非稳态吸积主导X射线双星从硬态到软态的态跃迁[J].天文学进展,2012,30(3):316-333,18.基金项目
国家自然科学基金(10773023,10833002,11073043) （10773023,10833002,11073043）
973计划(2009CB824800) （2009CB824800）
