Volume 464, Number 1, March II 2007AMBER: Instrument description and first astrophysical results
|Page(s)||291 - 297|
|Section||Stellar structure and evolution|
|Published online||19 December 2006|
Chandra observation of the dipping source XB 1254–690
Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, via Archirafi 36, 90123 Palermo, Italy e-mail: firstname.lastname@example.org
Accepted: 6 December 2006
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´´. Since the lightcurve did not show any significant variability, we extracted the spectrum corresponding to the whole observation. We confirmed the presence of the Kα 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.
Key words: accretion, accretion disks / stars: individual: XB 1254–690 / stars: neutron / X-rays: stars / X-rays: binaries / line: identification
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.