Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-25T14:30:25.693Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Alcock, C. 1979a, submitted to Ap. J.Google Scholar
Alcock, C. 19791b, in preparation.Google Scholar
Alcock, C. and Illarionov, A. 1979a, submitted to Ap. J.Google Scholar
Alcock, C. 1979b, submitted to Ap. J.Google Scholar
Bondi, H. and Hoyle, F. 1944, M.N.R.A.S., 117, 50.Google Scholar
Fontaine, G. and Michaud, G. 1979, preprint.Google Scholar
Fontaine, G. and Van Horn, H. M. 1976, Ap. J. Suppl., 31, 467.Google Scholar
Greenstein, J. L. 1969, Ap. J., 158, 281.Google Scholar
Liebert, J. 1976, Ap. J., 210, 715.CrossRefGoogle Scholar
Michaud, G. and Fontaine, G. 1979, Ap. J., 229, 694.Google Scholar
Schatzman, E. 1958, “White Dwarfs” (Amsterdam: North Holland).Google Scholar
Shipman, H. L. 1979, Ap. J., 228, 240.CrossRefGoogle Scholar
Strittmatter, P. A. and Wickramasinghe, D. T. 1971, M.N.R.A.S., 152, 47.Google Scholar
Trimble, V. and Greenstein, J. L. 1972, Ap. J. 177, 441.CrossRefGoogle Scholar
Vauclair, G., Vauclair, S., and Greenstein, J. L. 1979, preprint.Google Scholar
Weidemann, V. 1975, in “Problems in Stellar Atmospheres and Envelopes” eds. Bashek, B., Kegel, W. H., and Traving, G. (Berlin: Springer-Verlag).Google Scholar
Weidemann, V. 1977, Astron. Ap., 59, 411.Google Scholar
Wesemael, F. 1979, Astron. Ap.Google Scholar