Observations of Vela X-1 with RXTE
Abstract
We present results from observations of Vela X-1 obtained in February 1996 with RXTE. We have fitted phase averaged spectra with several models and compared our results with prior results obtained with HEXE and Ginga. No acceptable fit is possible with the models normally applied to X-ray binaries, instead we found a best fit using a power law with a Fermi-Dirac cutoff modified by one or two cyclotron absorption lines at ~25 keV and ~58 keV. In phase resolved spectral analysis we find that the cyclotron absorption is detectable only in the pulse, and is deeper in the first stronger pulse.
- Publication:
-
Proceedings of the Fourth Compton Symposium
- Pub Date:
- May 1997
- DOI:
- 10.1063/1.54151
- Bibcode:
- 1997AIPC..410..788K
- Keywords:
-
- 97.80.Jp;
- 95.85.Nv;
- 97.10.Ri;
- 98.70.Qy;
- X-ray binaries;
- X-ray;
- Luminosities;
- magnitudes;
- effective temperatures colors and spectral classification;
- X-ray sources;
- X-ray bursts