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Diffusion of Heavy Ions in Convective Envelopes, with Implications for the Masses of White Dwarfs

Published online by Cambridge University Press:  12 April 2016

Charles Alcock
Charles Alcock*
Affiliation:
Institute for Advanced Study, Princeton, New Jersey 08540

Extract

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Heavy ions rapidly sink out of the base of a white,, dwarf convective zone, and a balance is set up between accreting interstellar material and this sedimentation flux. The heavy element abundances are lower than they would be in the absence of convection. The accretion process is responsible for any gross departures from the cosmic abundance ratios among the heavy ions. A chemically pure white dwarf must have mass greater than 0.2 M⊙. The DB stars have masses lower than 0.4 M⊙.

Type
Colloquium Session III
Information
International Astronomical Union Colloquium , Volume 53: White Dwarfs and Variable Degenerate Stars , August 1979 , pp. 202 - 205
Copyright
Copyright © The University of Rochester 1979

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