EXOSAT Observations of the Pulse Profile of HERCULES-X-1 during Intermediate Intensity States in a 35-DAY Cycle in 1985
Abstract
In 1984 and 1985 Her X-1 was observed by EXOSAT during two 35 day cycles. A pulse profile change was observed and modeled by a free precessing neutron star. It is shown that the progressive intensity reduction from the left to the right pulse flank of the main pulse can be described by a highly ionized obscurating screen at the inner magnetospheric boundary of the accretion disk. There is evidence that the neutron Her X-1 performs a free precession movement.
- Publication:
-
Two Topics in X-Ray Astronomy, Volume 1: X Ray Binaries. Volume 2: AGN and the X Ray Background
- Pub Date:
- November 1989
- Bibcode:
- 1989ESASP.296..447K
- Keywords:
-
- Neutron Stars;
- Pulse Amplitude;
- Pulse Duration;
- Pulse Rate;
- Spectrum Analysis;
- Accretion Disks;
- Exosat Satellite;
- Occultation;
- Precession;
- Stellar Magnetospheres;
- Stellar Spectra;
- Astronomy