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 and \ion{Fe}{xxvi} K 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.
Keywords
Cite
@article{arxiv.astro-ph/0612269,
title = {Chandra Observation of the Big Dipper X 1624-490},
author = {R. Iaria and G. Lavagetto and A. D'Ai' and T. Di Salvo and N. R. Robba},
journal= {arXiv preprint arXiv:astro-ph/0612269},
year = {2009}
}
Comments
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)