A PARAMETER-SPACE STUDY OF CARBON-OXYGEN WHITE DWARF MERGERS
نویسندگان
چکیده
منابع مشابه
Remnant evolution after a carbon-oxygen white dwarf merger
We systematically explore the evolution of the merger of two carbon-oxygen (CO) white dwarfs. The dynamical evolution of a 0.9 M⊙ + 0.6 M⊙ CO white dwarf merger is followed by a three-dimensional SPH simulation. The calculation uses a state-of-the art equation of state that is coupled to an efficient nuclear reaction network that accurately approximates all stages from helium burning up to nucl...
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We determine the phase diagram for dense carbon-oxygen mixtures in white dwarf (WD) star interiors using molecular dynamics simulations involving liquid and solid phases. Our phase diagram agrees well with predictions from Ogata et al. and from Medin and Cumming and gives lower melting temperatures than Segretain et al. Observations of WD crystallization in the globular cluster NGC 6397 by Wing...
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We have found that at least seven hydrogen-deficient carbon (HdC) and R Coronae Borealis (RCB) stars, have O/O ratios close to and in some cases less than unity, values that are orders of magnitude lower than measured in other stars (the Solar value is 500). Greatly enhanced O is evident in every HdC and RCB we have measured that is cool enough to have detectable CO bands. The three HdC stars m...
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White dwarfs represent the endpoint of stellar evolution for stars with initial masses between approximately 0.07 M⊙ and 8-10 M⊙, where M⊙ is the mass of the Sun (more massive stars end their life as either black holes or neutron stars). The theory of stellar evolution predicts that the majority of white dwarfs have a core made of carbon and oxygen, which itself is surrounded by a helium layer ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2013
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/767/2/164