Abstract
We present the results of a 53 ks long Chandra observation of the dipping source XB 1254 - 690. During the observation neither bursts or dips were observed. From the zero-order image we estimated the precise X-ray coordinates of the source with a 90% uncertainty of 0.6". Since the lightcurve did not show any significant variability, we extracted the spectrum corresponding to the whole observation. We confirmed the presence of the FeXXVI K-a absorption lines with a larger accuracy with respect to the previous XMM EPIC pn observation. Assuming that the line width were due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines were produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.
Lingua originale | English |
---|---|
pagine (da-a) | 291-297 |
Numero di pagine | 7 |
Rivista | ASTRONOMY & ASTROPHYSICS |
Volume | 464 |
Stato di pubblicazione | Published - 2007 |
All Science Journal Classification (ASJC) codes
- ???subjectarea.asjc.3100.3103???
- ???subjectarea.asjc.1900.1912???