Chandra observation of the Big Dipper X 1624–490
Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, via Archirafi 36, 90123 Palermo, Italy e-mail: firstname.lastname@example.org
Accepted: 13 November 2006
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 h 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 . We confirm the presence of the Kα and Kα 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.
Key words: accretion, accretion disks / stars: individual: X 1624–490 / stars: neutron / X-rays: stars / X-rays: binaries / X-rays: general
© ESO, 2007