INTEGRAL Observations of Her X-l
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.
- Publication:
-
The Obscured Universe. Proceedings of the VI INTEGRAL Workshop
- Pub Date:
- 2007
- DOI:
- 10.48550/arXiv.0704.3062
- arXiv:
- arXiv:0704.3062
- Bibcode:
- 2007ESASP.622..461K
- Keywords:
-
- Astrophysics
- E-Print:
- To be published in the proceedings of the 6th INTEGRAL Workshop "The Obscured Universe" (3-7 July 2006, Moscow)