Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..687h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 15, 1986, p. 687-693.
Astronomy and Astrophysics
Astrophysics
35
Helium, Nuclear Reactions, Stellar Evolution, White Dwarf Stars, Carbon, Electron Capture, Nitrogen, Nuclear Fusion, Oxygen, Stellar Mass Accretion
Scientific paper
The role of the NCO reaction in the He-flash evolution of He white dwarfs undergoing mass accretion is investigated by means of numerical simulations, considering accretion of (3-100) x 10 to the -10th solar mass/yr onto a 0.3-solar-mass star. At lower accretion rates, N-14 is completely converted to C-14, and the He-flash is triggered by the CO reaction once the central density has increased sufficiently; at 10 to the -8th solar mass/yr, however, the CO reaction immediately follows the NC reaction and is responsible for rapid heating, triggering the 3-alpha reaction and He flash at density as low as 1 Mg/cu cm. The He-flash density in both cases is significantly lower than in corresponding scenarios without the NCO reaction.
Arai Kensuke
Hashimoto M.-A.
Kaminisi Keisuke
Nomoto K.-I.
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