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 K-alpha and Fe XXVI K-alpha 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.
IARIA R, LAVAGETTO G, D'AI' A, DI SALVO T, ROBBA N R (2007). Chandra observation of the Big Dipper X 1624-490. ASTRONOMY & ASTROPHYSICS, 463, 289-295 [10.1051/0004-6361:20065862].
Chandra observation of the Big Dipper X 1624-490
IARIA, Rosario;LAVAGETTO, Giuseppe;D'AI', Antonino;DI SALVO, Tiziana;ROBBA, Natale
2007-01-01
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 K-alpha and Fe XXVI K-alpha 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.
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