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

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arxiv astro-ph/9812128 v1 pith:ZZLSUBPS submitted 1998-12-07 astro-ph

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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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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  1. X-ray Dips and Polarization Angle Swings in GX 13+1

    astro-ph.HE 2025-01 conditional novelty 4.0 of 10

    In GX 13+1, X-ray polarization degree rises and the polarization angle swings by about 70 degrees between dip and off-dip states, following changes in source hardness and intensity.

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