INTEGRAL observations of HER X-1
Astrophysics
2007-05-23 v1
Abstract
First results of observations of the low mass X-ray binary Her X-1/HZ Her performed by the INTEGRAL satellite in July-August 2005 are presented. A significant part of one 35 day main-on state was covered. The cyclotron line in the X-ray spectrum is well observed and its position and shape, as well as its variability with time and phase of the 1.24 s pulsation are explored. X-ray pulse profiles for different energy bands are studied throughout the observation. The pulse period is found to vary on short time scales revealing a dynamical spin-up/spin-down behavior. Results of simultaneous optical observations of HZ Her are also discussed.
Cite
@article{arxiv.0704.3062,
title = {INTEGRAL observations of HER X-1},
author = {D. Klochkov and R. Staubert and S. Tsygankov and A. Lutovinov and K. P. Postnov and N. I. Shakura and S. A. Potanin and C. Ferrigno and I. Kreykenbohm and J. Wilms},
journal= {arXiv preprint arXiv:0704.3062},
year = {2007}
}