A Broad-Band X-Ray Telescope Spectrum of the Massive X-Ray Binary X Persei
Abstract
The Broad Band X-Ray Telescope, covering the 0.3-12 keV bandpass with moderate spectral resolution, observed the Be/X-ray binary X Per in 1990 December during the Astro-l mission on the Space Shuttle Columbia. The data obtained are the best to date to search for lines and edges. The data are well fitted by a power-law spectrum with a high-energy cutoff. A low value for the high-energy cutoff is found, implying a slightly weaker magnetic field strength for the X-ray pulsar. No iron line is present at about 6.5 keV with an equivalent width greater than 30-40 eV. The BBXRT observation corresponded to the 'off' state of X Per's recent 'phase change'.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1993
- DOI:
- 10.1086/172556
- Bibcode:
- 1993ApJ...407..744S
- Keywords:
-
- Astronomical Spectroscopy;
- B Stars;
- X Ray Binaries;
- X Ray Telescopes;
- Emission Spectra;
- Light Curve;
- Spectral Line Width;
- Stellar Luminosity;
- Astronomy;
- STARS: EMISSION-LINE;
- BE;
- STARS: INDIVIDUAL CONSTELLATION NAME: X PERSEI;
- STARS: NEUTRON;
- X-RAYS: STARS