Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978grsa.rept..315t&link_type=abstract
In its Gamma Ray Spectry. in Astrophys. p 315-322 (SEE N78-31971 22-88)
Astronomy and Astrophysics
Astronomy
6
Astronomical Spectroscopy, Emission Spectra, Flux Density, Gamma Ray Astronomy, Novae, Stellar Mass Ejection, Line Spectra, Positron Annihilation, Sodium Isotopes, Stellar Mass, Thermonuclear Reactions
Scientific paper
Activities identify the mechanisms responsible for the eruptions characterizing cataclysmic variables are concerned with close binary systems, the properties of which are dominated by the presence of mass transfer from a late-type star onto a white dwarf via an accretion disk. Theories for the outbursts vary in their identification of the eruption mechanism with either gravitational or nuclear energy sources. Existing models for the dwarf novae invoke a dynamical instability in the envelope of the red star which triggers episodic Roche lobe overflow and a concomitant increase in the rate of mass transfer and the outbursts are associated with an increase in the accretion luminosity liberated in the disk. The most successful theoretical models for common nova events involve thermonuclear runaways proceeding in accreted hydrogen envelopes on the white dwarf components of these systems. The characteristics of such runaway events, which can give rise to detectable gamma ray fluxes are discussed. Salient features of existing runaway models are reviewed. Gamma fluxes from Na-22 decay, positron annihilation, and shock induction are predicted.
Sparks Warren M.
Starrfield Sumner G.
Truran Jame. W.
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