Issue |
A&A
Volume 464, Number 1, March II 2007
AMBER: Instrument description and first astrophysical results
|
|
---|---|---|
Page(s) | 291 - 297 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20065644 | |
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: iaria@fisica.unipa.it
Received:
19
May
2006
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
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