The complex enviroment around Cir X-1
We present the results of a 54 ks long Chandra observation of the peculiar source Cir X-1. We perform a comparative analysis of X-ray spectra, selected at different flux levels of the source. This allows us to distinguish between a very hard state, at a low countrate, and a brighter, softer, highly absorbed spectrum during episodes of flaring activity. The spectrum of the hard state clearly shows emission lines of highly ionized elements. During the flaring state, the spectrum also shows strong resonant absorption lines, mostly in the Fe K region. Physical implications on the changing system geometry and plasma behavior is discussed and compared with past observations.
accretion discs-stars individual Cir X-1--stars neutron stars--X-ray stars--X-ray spectrum--X-ray general
A. DAi R. Iaria T. Di Salvo G. Lavagetto N. R. Robba
Dipartimento di Scienze Fisiche ed Astronomiche, Universita di Palermo, via Archirafin. 36, 90123 Palermo, Italy
国际会议
紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)
安徽黄山
英文
245-247
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）