Off‐Center Carbon Ignition in Rapidly Rotating, Accreting Carbon‐Oxygen White Dwarfs | Zendy

Hideyuki Saio | Zendy; K. Nomoto | Zendy

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Off‐Center Carbon Ignition in Rapidly Rotating, Accreting Carbon‐Oxygen White Dwarfs

Author(s) -

Hideyuki Saio,

K. Nomoto

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/423976

Subject(s) - white dwarf , physics , astrophysics , accretion (finance) , supernova , angular momentum , ignition system , rotation (mathematics) , stellar rotation , carbon fibers , astronomy , stars , classical mechanics , materials science , thermodynamics , geometry , mathematics , composite number , composite material

We study the effect of stellar rotation on the carbon ignition in acarbon-oxygen white dwarf accreting CO-rich matter. Including the effect of thecentrifugal force of rotation, we have calculated evolutionary models up to thecarbon ignition for various accretion rates. The rotation velocity at thestellar surface is set to be the Keplerian velocity. The angular velocity inthe stellar interior has been determined by taking into account the transportof angular momentum due to turbulent viscosity. We have found that anoff-center carbon ignition occurs even when the effect of stellar rotation isincluded if the accretion rate is sufficiently high; the critical accretionrate for the off-center ignition is hardly changed by the effect of rotation.Rotation, however, delays the ignition;i.e., the mass coordinate of theignition layer and the total mass at the ignition are larger than those for thecorresponding no-rotating model. The result supports our previous conclusionthat a double-white dwarf merger would not be a progenitor of a SN Ia.Comment: 18 pages, 6 figures; To appear in the Astrophysical Journal, 1 November 2004, V615 issu

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