Publication Abstracts

Baker and Kippenhahn 1962

Baker, N., and R. Kippenhahn, 1962: The pulsations of models of δ Cephei stars. Z. Astrophys., 54, 114.

Model envelopes (in hydrostatic equilibrium) have been integrated for five population I stars in and near the δ Cephei region of the Hertzsprung-Russell diagram. Linearized time-dependent equations representing radial pulsations of these equilibrium models were then solved numerically in order to study their stability against pulsation; that is, to determine whether a small radial distortion of the equilibrium models decreases (stability) or increases (instability) with time in order to make the star pulsate like the observed pulsating variables. It is found that a star in the δ Cephei region (M = 11.5 M, L = 5000 L, Te = 5390°) having a period of 6d is pulsationally unstable due to the destabilizing effect of the He+ ionization region. Overtone pulsations of this model appear to be damped. Models having higher effective temperatures than cepheids, as well as stars having smaller mass or higher luminosity, and obeying the same period-density relation as cepheids, are stable.

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BibTeX Citation

@article{ba01400g,
  author={Baker, N. and Kippenhahn, R.},
  title={The pulsations of models of δ Cephei stars},
  year={1962},
  journal={Zeitschrift für Astrophysik},
  volume={54},
  pages={114},
}

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RIS Citation

TY  - JOUR
ID  - ba01400g
AU  - Baker, N.
AU  - Kippenhahn, R.
PY  - 1962
TI  - The pulsations of models of δ Cephei stars
JA  - Z. Astrophys.
JO  - Zeitschrift für Astrophysik
VL  - 54
SP  - 114
ER  -

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