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

2); (2) Max-Planck-Institut fuer extraterrestrische Physik; (3) CASS; Astronomie; B. Stelzer (1; D. Gruber (3); Garching; J. Wilms (1); R. Rothschild (3) ((1) Institut fuer Astronomie und Astrophysik; R. Staubert (1)

arxiv: astro-ph/9812128 · v1 · submitted 1998-12-07 · 🌌 astro-ph

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

B. Stelzer (1 , 2) , J. Wilms (1) , R. Staubert (1) , D. Gruber (3) , R. Rothschild (3) ((1) Institut fuer Astronomie und Astrophysik , Tuebingen , Astronomie

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(2) Max-Planck-Institut fuer extraterrestrische Physik Garching (3) CASS University of California at San Diego)

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keywords evolutionparameterspre-eclipsespectraltimevaryingx-raybinary

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

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