X-ray Dip Monitoring of XB 1916-053

Details X-ray Dip Monitoring of XB 1916-053 X-ray Dip Monitoring of XB 1916-053

2003-05-06

arxiv.org/abs/astro-ph/0305085v1

Astrophys.J. 593 (2003) 1007-1012

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ, 15 pages

Scientific paper

10.1086/376693

We report on the long term monitoring of X-ray dips from the ultracompact low-mass X-ray binary (LMXB) XB 1916-053. Roughly one-month interval observations were carried out with the Rossi X-ray Timing Explorer (RXTE) during 1996, during which the source varied between dim, hard states and more luminous, soft states. The dip spectra and dip lightcurves were compared against both the broadband luminosity and the derived mass accretion rate Mdot. The dips spectra could be fitted by an absorbed blackbody plus cut-off power law non-dip spectral model, with additional absorption ranging from 0 to >100 x 10^22 cm^-2. The amount of additional blackbody absorption was found to vary with the source luminosity. Our results are consistent with an obscuration of the inner disk region by a partially ionized outer disk. The size of the corona, derived from the dip ingress times, was found to be ~10^9 cm. The corona size did not correlate with the coronal temperature, but seemed to increase when \Mdot also increased. We discuss our findings in the context of an evaporated accretion disk corona model and an ADAF-type model.

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