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Element Abundances in White Dwarfs of Spectral Type DF

  • G. Wegner (a1)

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DF and DG white dwarfs are the only types which show metal lines (see Greenstein). Presently the only analysis is that of Weidemann who analyzed the star van Maanen 2 and found that the abundances of metals and hydrogen are the order of 10-3 and 10-2 that of solar, respectively. Bues finds H = 1 : 105 and Z = 2 × 10-4 for DB stars.

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1 Greenstein, J. L., Hdb. d. Phys., 59, 161 (1958) and Stars and Stellar Systems, 4, 676 University of Chicago Press 1960.
2 Weideroann, V., Ap. J., 131, 638 (1960).
3 Bues, I., Astronomy and Astrophysics, 7, 91 (1970).
4 Lucy, L. B., Proceedings First Harvard-Smithsonian Conference on Stellar Atmospheres, (Smithsonian Institution Astrophysical Observatory Special Report No. 167), 148 (1964).
5 Böhhm, K. H., Astrophysics and Space Science, 2, 375 (1968).
6 Przybylski, A., M.N.R.A.S., 115, 650 (1955).
7 Unsöld, A., Physik der Sternatmosphären, 2nd edition, Springer-Verlag, Berlin 1955.
8 Hindmarsh, W. R., Petford, A. D. and Smith, G., Proceedings of the Royal Society of London, Series A, 297, 296 (1967).
9 Schatzman, E., Astronomy and Astrophysics, 3, 331 (1969).

Element Abundances in White Dwarfs of Spectral Type DF

  • G. Wegner (a1)

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