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 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 Ca XX. We confirm the presence of the Fe XXV Kα and Fe XXVI 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2007
- DOI:
- 10.1051/0004-6361:20065862
- arXiv:
- arXiv:astro-ph/0612269
- Bibcode:
- 2007A&A...463..289I
- Keywords:
-
- accretion;
- accretion disks;
- stars:;
- individual: X 1624-490;
- stars: neutron;
- X-rays: stars;
- X-rays: binaries;
- X-rays: general;
- Astrophysics
- E-Print:
- 8 pages, 5 figures, accepted by A&