Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..163f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 163-172.
Astronomy and Astrophysics
Astronomy
41
Kelvin-Helmholtz Instability, Novae, Stellar Mass Accretion, Stellar Rotation, Angular Momentum, Baroclinic Instability, Neutron Stars, White Dwarf Stars, X Ray Astronomy
Scientific paper
The problem of how angular momentuim and material are re-distributed through hydrodynamical instabilities in a differentially rotating star is considered and applied to dengenerated stars accreting matter from a disk. It is shown that the instabilities to non-axisymmetric adiabatic disturbances play dominant roles in determining the distribution of angular momentum. Turbulent motions generated by the instabilities also cause the mixing of elements between the accreted and stellar material. For white dwarfs and neutron stars, angular momentum carried in by accreted gas is to be stretched out much beyond the accreted layers by factors 10 to 100 and 102 to 104, resepectively, and the structure is forced into practically uniform rotation at a sufficiently deep layer. In contrast, the degree of the element mixing amounts only to several and several ten times, respectively. The influence of disk accretion on the evolution to thermonuclear runaways is discussed.
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