Abstract
Model atmospheres with temperatures in the range 10000≤T eff≤25000 K and with gravities 6≤log(g)≤9 have been constructed for various helium abundances with a view to understanding the spectra of the hotter white dwarfs. It is shown that the DB stars are confined to the temperature range 15000≤T eff≤18000 K in which convection also becomes important in the outer layers of helium rich stars. The DA stars seem to avoid this temperature range. The hydrogen and metal abundances in DB atmospheres are shown to be reduced by factors 105 and 103 respectively compared to solar values. Possible explanations of DB and DC spectra are discussed.
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References
Avrett, F. H. and Krook, M.: 1963, Astrophys. J. 137, 874.
Bondi, H. and Hoyle, F.: 1944, Monthly Notices Roy. Astron. Soc. 104, 273.
Brechot-Sahal, S.: 1968, Z. Astrophys. 69, 74.
Eggen, O. J.: 1970, Astrophys. J. 159, 945.
Eggen, O. J. and Greenstein, J. L.: 1965, Astrophys. J. 141, 83.
Eggen, O. J. and Greenstein, J. L.: 1967, Astrophys. J. 150, 927.
Greenstein, J. L.: 1960, Stars and Stellar Systems 6 (ed. by J. L. Greenstein), University of Chicago Press, Chicago, p. 676.
Greenstein, J. L.: 1969, Astrophys. J. 158, 281.
Griem, H.: 1968, Astrophys. J. 154, 1111.
Klemola, A. R.: 1961, Astrophys. J. 134, 130.
Mathews, T. A. and Sandage, A.: 1963, Astrophys. J. 138, 30.
Somerville, W. B.: 1965, Astrophys. J. 141, 811.
Strittmatter, P. A. and Wickramasinghe, D. T.: 1970, Monthly Notices Roy. Astron. Soc.,in press (paper III).
Terashita, Y. and Matsushima, S.: 1969, Astrophys. J. 156, 183.
van Horn, H. M.: 1970, Astrophys. J. Letters 160, 53.
Vardya, M. S.: 1961, Astrophys. J. 133, 107.
Wickramasinghe, D. T. and Strittmatter, P. A.: 1969, Astron. Astrophys. 2, 242.
Wickramasinghe, D. T. and Strittmatter, P. A.: 1970, Monthly Notices Roy. Astron. Soc.,150, 435 (paper II).
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Strittmatter, P.A., Wickramasinghe, D.T. (1971). The Line Spectra of White Dwarfs . In: Luyten, W.J. (eds) White Dwarfs. International Astronomical Union/Union Astronomical International, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3081-6_16
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DOI: https://doi.org/10.1007/978-94-010-3081-6_16
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