X-Ray Observations of OAO 1657-415 with TENMA and GINGA
Abstract
A pulse timing analysis of X-ray pulsar OAO 1657-415 with the Tenma and Ginga satellites is presented. The long-term pulse period history shows a spin-up trend with an average rate of dot {P}/P = -10(-3) yr(-1) . An upper limit to a_xsin i of 3 lt-s was obtained for the projected semi-major axis for a range of orbital periods of 1 to 6 d. The X-ray spectrum obtained with Ginga was found to be typical of those of other binary X-ray pulsars.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- December 1990
- Bibcode:
- 1990PASJ...42..785K
- Keywords:
-
- Ginga Satellite;
- Pulsars;
- Spaceborne Astronomy;
- X Ray Binaries;
- X Ray Spectra;
- Heao 2;
- Japanese Spacecraft;
- Neutron Stars;
- Oao;
- Spectrum Analysis;
- Astronomy;
- OAO 1657-415;
- X-RAY BINARIES;
- X-RAY PULSARS