Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.236...29l&link_type=abstract
In ESA Recent Results on Cataclysmic Variables p 29-32 (SEE N86-20287 10-93)
Physics
2
Cataclysmic Variables, Collapse, Stellar Evolution, White Dwarf Stars, X Ray Sources, Neutron Stars, Stellar Cores, Stellar Mass Accretion, Supernovae
Scientific paper
It is shown that if an accreting carbon-oxygen white dwarf is partially solid at the moment of the central ignition, the total disruption of the star may be avoided and the formation of a neutronized remnant ensured. The mass accreting carbon-oxygen white dwarfs could thus account for Type 1 supernovae and the presence of neutron stars in low-mass binaries. The parameter that determines the evolutionary outcome is the degree of chemical differentiation due to solidification before the accretion phase. Maximum separation leads to collapse, possibly without explosion, while partial separation leads to off-center carbon ignition and explosive burning of different amounts of the carbon-oxygen mixture. Even in this last case the formation of a bounded remnant, either a neutron star or a white dwarf, is not ruled out since the solid core would likely survive the explosion. But now, as the ejected matter is much greater, the binary system would probably be disrupted.
Canal Ramon
Garcia-Berro Enrique
Hernanz Margarida
Isern Jordi
Labay Javier
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