Statistics – Applications
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..145d&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 145-156. NASA-supported research
Statistics
Applications
35
Rotating Fluids, Stellar Mass Accretion, Stellar Models, White Dwarf Stars, Angular Momentum, Angular Velocity, Baryons, Binary Stars, Degenerate Matter, Hydrodynamics, Particle Motion, Self Consistent Fields, Stellar Envelopes, Stellar Gravitation, X Ray Sources
Scientific paper
Numerical sequences of rotating axisymmetric nonmagnetic equilibrium models are constructed which represent the evolution of a barytropic star as it accretes material from a rotating medium. Two accretion geometries are considered - one approximating accretion from a rotating cloud and the other, accretion from a Keplerian disk. It is assumed that some process, such as Ekman spin-up or nonequilibrium oscillations, maintains nearly constant angular velocity along cylinders about the rotation axis. Transport of angular momentum in the cylindrically radial direction by viscosity is included. Fluid instabilities and other physical processes leading to enhancement of this transport are discussed. Particular application is made to zero-temperature white-dwarf models, using the degenerate electron equation of state. An initially nonrotating 0.566-solar-mass white dwarf is followed during the accretion of more than one solar mass of material. Applications to degenerate stellar cores, to mass-transfer binary systems containing white dwarfs, such as novae and dwarf novae, to Type I supernovae, and to galactic X-ray sources are considered.
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