Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..521i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 521-540. Research supported by Japan Society for the
Astronomy and Astrophysics
Astrophysics
65
Accretion Disks, Cataclysmic Variables, Particle Diffusion, Stellar Envelopes, White Dwarf Stars, Abundance, Convection-Diffusion Equation, Heavy Elements, Novae
Scientific paper
Results are presented of numerical experiments conducted to determine the degree of enhancement of CNO elements in the envelope of a 1 solar mass carbon-oxygen white dwarf accreting hydrogen-rich material at rates of 10 exp -10, 10 exp -9, and 10 exp -8 solar mass/yr. In the steady state cases for which dM/dt is not less than 10 exp -9 solar mass/yr, both ordinary convection and diffusion contribute to the intermixing of hydrogen with carbon and oxygen prior to hydrogen ignition. The large contrast in radiative opacity near the interface between carbon-rich material and hydrogen-rich material is responsible for the establishment of a prerunaway convective zone. In the case of a helium buffer layer of 0.001 solar mass, approximately 3 percent of the mass of the helium layer is incorporated into the convective shell during the runaway, and negligible surface enhancements of heavy elements are found.
Fujimoto Masayuki Y.
Iben Icko Jr.
MacDonald Jim
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