Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176..262l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 2, April 1987, p. 262-266. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
30
Accretion Disks, Emission Spectra, Stellar Radiation, Symbiotic Stars, X Ray Binaries, Black Body Radiation, Bremsstrahlung, Exosat Satellite, Thermal Radiation, Ultraviolet Radiation, X Ray Spectra
Scientific paper
CH Cyg was observed with the EXOSAT LE1 telescope and CMA detector with 3 filters on 1985 May 24. The count rates indicate a soft X-ray spectrum with kT ≈ 0.1 keV and column density ≈4×1020 cm-2. The observed flux is ≈1.3×10-11erg cm-2s-1. An earlier upper limit obtained with the Einstein Imaging Proportional Counter indicates long-term variability. Variability on a several minute timescale is found in the current data with 94% confidence. The current observations are consistent with emission from: a boundary layer between an accretion disk and an accreting white dwarf companion to the M6 III star; shocked gas formed in the collision of a fast wind from a white dwarf and the red giant wind; or a sheath of shocked gas surrounding the radio jets. If the short timescale variability is confirmed, only the first alternative is viable.
Leahy Denis A.
Taylor Russ A.
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