Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303l...5s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 303, April 1, 1986, p. L5-L9. DOE-supported researc
Astronomy and Astrophysics
Astrophysics
96
Hydrodynamics, Novae, Stellar Composition, Stellar Evolution, Stellar Mass Ejection, Aluminum, Carbon, Magnesium, Neon, Oxygen, Stellar Magnitude
Scientific paper
This letter identifies and seeks to explain the characteristics of a new class of novae. This class consists of those objects that have been observed to eject material rich in oxygen, neon, magnesium, and aluminum at high velocities. It is proposed that for this class of novae the outburst is occurring not on a carbon-oxygen white dwarf but on an oxygen-neon-magnesium white dwarf which has evolved from a star which has a main-sequence mass of 8-12 solar masses. Such an outburst has been simulated by evolving 1.25 solar mass white dwarfs accreting hydrogen-rich material at various rates. The effective enrichment of the envelope by ONeMg material from the core is simulated by enhancing oxygen in the accreted layers. The resulting evolutionary sequences are the most violent that have yet been studied and can eject the entire accreted envelope plus core material at high velocities. They can also become super-Eddington at maximum bolometric luminosity. The expected frequency of such events (about 1/4) is in good agreement with the observed numbers of these novae.
Sparks Warren M.
Starrfield Summer
Truran Jame. W.
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