Skip to main content
Passa alla visualizzazione normale.

ROSARIO IARIA

The complex enviroment around Cir X-1

  • Authors: D'AÍ, A; IARIA, R; DI SALVO, T; LAVAGETTO, G; ROBBA, NR
  • Publication year: 2008
  • Type: Capitolo o Saggio (Capitolo o saggio)
  • Key words: X-ray, Accretion and accretion disks, Neutron stars, X-ray binaries
  • OA Link: http://hdl.handle.net/10447/46435

Abstract

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.