EXOSAT Observations of the 35-DAY Cycle of HER X-1; Evidence for Neutron Star Precession
Abstract
The authors have observed Her X-1 with the EXOSAT satellite throughout a 35-day cycle at about four day sampling intervals. These measurements include for the first time an accurate measurement of the 1.24 sec pulse profiles seen during the short-on state at the middle of the 35-day cycle. The data show a large change in the pulse profiles between the main and short-on states, suggesting a precession of the magnetic dipole axis of the rotating neutron star.
- Publication:
-
The Evolution of Galactic X-Ray Binaries
- Pub Date:
- 1986
- Bibcode:
- 1986ASIC..167..239T