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 FeXXVI K-a 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.
IARIA R, DI SALVO T, LAVAGETTO G, D'AI' A, ROBBA N R (2007). Chandra observation of the dipping source XB 1254-690. ASTRONOMY & ASTROPHYSICS, 464, 291-297 [10.1051/0004-6361:20065644].
Chandra observation of the dipping source XB 1254-690
IARIA, Rosario;DI SALVO, Tiziana;LAVAGETTO, Giuseppe;D'AI', Antonino;ROBBA, Natale
2007-01-01
Abstract
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 FeXXVI K-a 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.File | Dimensione | Formato | |
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