Ariel V observations of A 4.8-(HR). Periodicity in the "high state" X-Ray spectrum of CYG X-3.
Abstract
Observations of Cygnus X-3 in 1975 May with the Ariel V proportional counter spectrometer reveal the existence of 4.8-hr periodic variations in the X-ray spectrum. Periodicity is observed in both the 2-6 keV continuum shape, and in the apparent energy of the iron-line, and occurs at a time of high mean source intensity. These results are compared with a similar behaviour noted by Becker et al. for the "low-state" spectrum. In contrast to the low-state observations, the data presented here do not suggest phase dependent absorption by material local to the source.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 1981
- DOI:
- 10.1093/mnras/194.1.77
- Bibcode:
- 1981MNRAS.194...77B
- Keywords:
-
- Ariel 5 Satellite;
- Binary Stars;
- Stellar Spectra;
- X Ray Sources;
- Energy Spectra;
- Proportional Counters;
- X Ray Spectra;
- Astrophysics