Chandra Observation of the Dipping Source XB 1254-690

Details Chandra Observation of the Dipping Source XB 1254-690 Chandra Observation of the Dipping Source XB 1254-690

2006-12-20

arxiv.org/abs/astro-ph/0612592v1

Astronomy and Astrophysics

Astrophysics

8 pages, 10 figs, accepted by A&A on 6 December 2006

Scientific paper

10.1051/0004-6361:20065644

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\arcsec. Since the lightcurve did not show any significant variability, we extracted the spectrum corresponding to the whole observation. We confirmed the presence of the \ion{Fe}{xxvi} K$_\alpha$ 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.

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