supported in part by the National Natural Science Foundation of China (Grant Nos. 0773023,10833002 and 11073043);the One Hundred Talents project of the Chinese Academy of Sciences;the Shanghai Pujiang Program (08PJ14111);the National Basic Research Program of China (973project 2009CB824800);the grant for concept study of space science from the Chinese Academy of Science;the starting funds at the Shanghai Astronomical Observatory
We have studied X-ray spectral state transitions that can be seen in the long- term monitoring light curves of bright X-ray binaries from the All-Sky Monitor (ASM) onboard the Rossi X-ray Timing Explorer (RXTE) an...