Spin-up and mixing in accreting white dwarfs

Details Spin-up and mixing in accreting white dwarfs Spin-up and mixing in accreting white dwarfs

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..316l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 316-325.

Astronomy and Astrophysics

Astrophysics

45

Novae, Stellar Mass Accretion, Stellar Mass Ejection, Stellar Rotation, White Dwarf Stars, Angular Momentum, Angular Velocity, Momentum Transfer, Stellar Models

Scientific paper

It is demonstrated that existing theories of mixing in accreting white dwarfs encounter difficulties when confronted with observations of enrichments in nova ejecta. Arguments are presented, based on the Ekman spin-up process, which suggest that angular momentum transport from the accreted material to the white dwarf is more efficient than previously thought. This should lead to matter spreading over the entire white dwarf surface, as well as inward mixing. It is shown that when efficient transfer of angular momentum is taken into account, the gross features of nova outbursts can be reproduced, with the runaway occuring in a mixed layer. Some implications of the results for DQ Her, the hibernation model of novae, recurrent novae, and soft X-ray emission are discussed.

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