Radial Oscillation Periods for Hamada—Salpeter Models of White Dwarfs

  • J. Skilling


Radial pulsations of white dwarfs may be responsible for the radio pulses discovered by Hewish et al. 1, and so quantitative computations of the oscillation periods have become important to observational astronomers. The calculations of Meltzer and Thorne2 are based on the Harrison-Wheeler-Wakano equation of state, which describes cold matter continuously catalysed to the composition of lowest free energy. As these authors point out, nuclear thermodynamic equilibrium is unlikely to be reached in real white dwarfs; real white dwarfs are probably better described by the Hamada-Salpeter3 models, which may be made of various elements such as helium, carbon and iron. The Hamada-Salpeter models also use an equation of state due to Salpeter4, which takes into account various forces between the particles of the degenerate matter.


  1. 1.
    Hewish, A., Bell, S. J., Pilkington, J. D. H., Scott, P. F., and Collins, R. A., Nature, 217, 709 (1968), (Paper 1).ADSCrossRefGoogle Scholar
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    Meltzer, D. W., and Thorne, K. S., Ap. J., 145, 514 (1966).ADSCrossRefGoogle Scholar
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    Hamada, T., and Salpeter, E. E., Ap. J., 134, 683 (1961).ADSCrossRefMathSciNetGoogle Scholar
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    Salpeter, E. E., Ap. J., 134, 669 (1961).ADSCrossRefMathSciNetGoogle Scholar
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    Ledoux, P., and Walraven, T., Handbuch der Physik, 51, 463 (1958).Google Scholar

Copyright information

© Springer Science+Business Media New York 1968

Authors and Affiliations

  • J. Skilling
    • 1
  1. 1.Mullard Radio Astronomy Observatory, Cavendish LaboratoryUniversity of CambridgeUK

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