Chandra Observation of the Big Dipper X 1624-490

Abstract

We present the results of a 73 ks long Chandra observation of the dipping source X 1624-490. During the observation a complex dip lasting 4 hours is observed. We analyse the persistent emission detecting, for the first time in the 1st-order spectra of X 1624-490, an absorption line associated to \ion{Ca}{xx}. We confirm the presence of the \ion{Fe}{xxv} K${}_{\alpha }$ and \ion{Fe}{xxvi} K${}_{\alpha }$ absorption lines with a larger accuracy with respect to a previous XMM observation. Assuming that the line widths are due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines have been produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.

8 pages, 5 figures, accepted by A&A on 13/11/2006. Revised version with minor points corrected and reference added to the used data taken from the Chandra Public Archive (Obsid 4559)

References in corpus (1)

• Detection of Highly Ionized Metal Absorption Lines in the Ultracompact X-ray Dipper 4U 1916-05

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• The first extragalactic ultra-compact X-ray binary : a candidate black hole-white dwarf system