Probing the outer edge of an accretion disk: A Her X-1 turn-on observed with RXTE

Details Probing the outer edge of an accretion disk: A Her X-1 turn-on observed with RXTE Probing the outer edge of an accretion disk: A Her X-1 turn-on observed with RXTE

2005-07-08

arxiv.org/abs/astro-ph/0507198v1

Astronomy and Astrophysics

Astrophysics

16 pages, 13 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20042355

We present the analysis of Rossi X-ray Timing Explorer (RXTE) observations of the turn-on phase of a 35 day cycle of the X-ray binary Her X-1. During the early phases of the turn-on, the energy spectrum is composed of X-rays scattered into the line of sight plus heavily absorbed X-rays. The energy spectra in the 3-17 keV range can be described by a partial covering model, where one of the components is influenced by photoelectric absorption and Thomson scattering in cold material plus an iron emission line at 6.5 keV. In this paper we show the evolution of spectral parameters as well as the evolution of the pulse profile during the turn-on. We describe this evolution using Monte Carlo simulations which self-consistently describe the evolution of the X-ray pulse profile and of the energy spectrum.

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