Evolution of spectral parameters during a pre-eclipse dip of Her X-1

Details Evolution of spectral parameters during a pre-eclipse dip of Her X-1 Evolution of spectral parameters during a pre-eclipse dip of Her X-1

1998-12-07

arxiv.org/abs/astro-ph/9812128v1

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures, accepted for publication in Astronomy & Astrophysics

Scientific paper

We report on a pre-eclipse dip of the X-ray binary Her X-1 observed by the Rossi X-ray Timing Explorer (RXTE) in July 1996. We present the evolution of the spectral parameters in the 3-18 keV range with a temporal resolution of 16 s and show that the varying flux of the spectrum can be interpreted solely by a time varying column density. We also find that the lightcurve is characterized by symmetric substructures with recurrence time of a few minutes that can be successfully modeled by Gaussian profiles.

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