Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..739a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Nov. 1981, p. 739-743.
Astronomy and Astrophysics
Astronomy
45
Astronomical Spectroscopy, Companion Stars, X Ray Astronomy, Astronomical Catalogs, Novae, Spaceborne Astronomy, Stellar Models, White Dwarf Stars, X Ray Sources
Scientific paper
X-ray observations of 19 symbiotic stars made with the imaging proportional counter onboard the Einstein Observatory are reported. Three of the sources, HM Sge, V 1016 Cyg and RR Tel, were detected as soft X-ray sources, with blackbody temperatures of about 1,000,000 K or less. The symbiotic stars detected as X-ray sources are all noted to have undergone slow-nova outbursts in historic times, and to have X-ray luminosities, scaled according to the visible magnitude, decreasing with time since the outbursts. Results support a model of slow novae as representing thermonuclear events on white dwarfs accreting matter from M giants companions, while the symbiotic stars in their steady states are powered by the accretion process alone.
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