Acceleration of Hercules X-1 pulsar rotation. The "Kvant" module observations in august 1987-july 1988.
Abstract
Observations of the international X-ray observatory "Roentgen" on the "Kvant" module in August 1987 revealed the significant decrease of the Hercules X-1 pulsation period. Further observations in 1988 allow to estimate the average period derivative P/P = (-4.9±1.5)×106year-1. Comparison of the "Kvant" data with previous observations has shown that in 1984 - 1988 Hercules X-1 underwent quasistationary acceleration like that one observed in 1972 - 1978.
- Publication:
-
Pisma v Astronomicheskii Zhurnal
- Pub Date:
- November 1988
- Bibcode:
- 1988PAZh...14..979S
- Keywords:
-
- Acceleration (Physics);
- Pulsars;
- Stellar Rotation;
- X Ray Binaries;
- Light Curve;
- Pulsar Magnetospheres;
- Stellar Spectrophotometry;
- Variable Stars;
- Astronomy