Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..251b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 1, 1987, p. 251-257.
Astronomy and Astrophysics
Astronomy
1
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
Scientific paper
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.
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