Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..144m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 144-156.
Astronomy and Astrophysics
Astronomy
27
Binary Stars, Stellar Spectra, Symbiotic Stars, Ultraviolet Spectra, Wolf-Rayet Stars, X Ray Stars, Accretion Disks, Bremsstrahlung, Iue, Satellite Observation, Stellar Models, X Ray Astronomy
Scientific paper
The authors present IUE fluxes of the symbiotic star HM Sge, extracted from IUE observations made during the years 1978 - 1983. They argue in favour of an accretion disc model. They suggest that the sudden flux increase in He II and the more highly ionized atoms were due to a decrease from a high mass accretion rate, leading to a luminosity above the Eddington limit, to a lower rate leading to a luminosity below that limit. A thermonuclear runaway model might, however, present an alternative. For elemental abundances it is found that by number He/H = 0.14, that within the uncertainty limits, the oxygen and neon abundances are essentially solar, with a slight overabundance of carbon and silicon, and nitrogen is enhanced by approximately a factor 8. Contrary to an occasionally stated opinion the authors do not believe that HM Sge should be associated with a Wolf-Rayet star.
Mueller Beatrice E. A.
Nussbaumer Harry
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