Identification of the soft X-ray source H1011-47 (= E1013-477): a newmagnetic variable?
Abstract
A variable blue emission-line star is determined to be the probable counterpart of the HEAO-1 soft X-ray source H1011-47 on the basis of an improved position derived with the Einstein satellite. The star is found to vary between magnitudes of 16.7 and 17.7 on a time scale of approximately 100 minutes and by as much as 0.6 magnitude on a time scale of a few minutes. The spectrum shows strong, broad optical emission lines of hydrogen, He I, He II, and Ca II and strong ultraviolet emission lines of C IV and Si IV. These characteristics indicate that the star most probably belongs to the AM Her class of magnetic cataclysmic binary. A comparison of the HEAO-1 and Einstein fluxes for the source indicates that it is variable in the long term by at least a factor of ten. Attention is also given to two other faint X-ray sources observed in or near the HEAO-1 error box. One is identified with an 8th magnitude star, the other with a quasar having a redshift z of 0.42.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 1983
- DOI:
- 10.1086/131177
- Bibcode:
- 1983PASP...95..370M
- Keywords:
-
- Magnetic Stars;
- Spaceborne Astronomy;
- Variable Stars;
- X Ray Sources;
- Emission Spectra;
- Heao 2;
- Line Spectra;
- Stellar Magnitude;
- Ultraviolet Astronomy;
- Astronomy;
- AM Herculis Stars:X-Ray Sources;
- Optical Spectra:X-Ray Sources;
- X-Ray Sources:AM Herculis Stars;
- X-Ray Sources:Optical Counterparts;
- X-Ray Sources:Optical Spectra