Observations of X-ray emission from the RS CVn binary HD 155555 and the detection of a nearby serendipitous source.
Abstract
Results of the EXOSAT observation of the RS CVn binary HD 155555 are reported. A new source EXO 171224-6653.9 has been discovered, lying only 40 arcsec away from HD 155555. Broad band X-ray photometry allows constraints to be placed on the plasma temperature (5×105 - 1.3×106K) and emission measure (4.5×1051 - 8×1051cm-3) of HD 155555. When compared with earlier X-ray observations, the combined luminosity of the two sources can be seen to have decreased by an order of magnitude. Several explanations of this are discussed. A likely optical counterpart (mj = 12.6) to EXO 171224-6653.9 has been found. The X-ray to optical luminosity ratio indicates that it is an accretion driven source, probably a cataclysmic variable or high mass X-ray binary.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1987
- DOI:
- 10.1093/mnras/228.2.251
- Bibcode:
- 1987MNRAS.228..251B
- Keywords:
-
- Emission Spectra;
- Spaceborne Astronomy;
- Stellar Spectrophotometry;
- Variable Stars;
- X Ray Binaries;
- X Ray Spectra;
- Exosat Satellite;
- Plasma Temperature;
- Radiation Sources;
- Stellar Luminosity;
- Stellar Mass Accretion;
- Visible Spectrum;
- Astrophysics