Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445l.149g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 445, no. 2, p. L149-L151
Astronomy and Astrophysics
Astrophysics
28
Cataclysmic Variables, Convection, Convective Flow, Hydrodynamics, Hydrogen, Novae, Thermonuclear Reactions, White Dwarf Stars, Stellar Cores, Stellar Evolution, Stellar Models
Scientific paper
The evolution of a fully developed convective hydrogen-rich envelope on top of a C-O white dwarf, at a stage close to thermonuclear runaway, is investigated using a two-dimensional implicit hydrocode. We find that convection plays a crucial role in the burning process when multidimensional effects are taken into account. Temperature fluctuations caused by convective mixing give rise to local enhancement of nuclear burning. Nonsimultaneous eruptions of fast burning, lasting for a few seconds, occur locally at the base of the hydrogen envelope. The convection cells bounded within by the envelope, become violent near such eruption sites and induce further eruptions nearby. The burning process slows down only after enough energy is released and global expansion takes place. Since the flow satys subsonic all through the runaway, the pressure equalizes laterally and the expansion is almost spherically symmetric.
Glasner Ami S.
Livne Eli
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