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Line Profiles of the β Cephei Stars

Published online by Cambridge University Press:  25 April 2016

P. A. Stamford  and
R. D. Watson
P. A. Stamford
Affiliation:
Department of physis, University of Tasmania
R. D. Watson
Affiliation:
Department of physis, University of Tasmania
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Extract

The β Cephei variables are a group of short period pulsating variables of early spectral type for which no satisfactory physical driving mechanism has yet been discovered. Further it is not clear what form of pulsation these stars are undergoing. The existence of a beat phenomenon and a phase of spectral line broadening is well established in some of these stars. This extends to observed spectral line doubling in three stars, BW Vul, σ Sco and 12 Lac. Because of the difficulty in explaining these phenomena with purely radial oscillations, Ledoux (1951) first suggested the possibility of non-radial oscillations. Other stars in the group, γ Peg, δ Cet, #x03BE;’ CMa and β Cep have approximately sinusoidal velocity and light curves with little indication of spectral line broadening. For these there is probably no a priori observational need to look beyond purely radial oscillations. It is of course conceivable that different modes of oscillation are present in different members of the β Cephei group. However, if line profiles are calculated for various proposed oscillation modes and compared with the observations, it may be possible to eliminate some suggestions and hence limit the search for an instability mechanism.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 1 , September 1976 , pp. 75 - 78
Copyright
Copyright © Astronomical Society of Australia 1976

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References

Chandrasekhar, S., and Lebovitz, N. R., Astrophys. J., 136, 1105 (1962).CrossRefGoogle Scholar
Christy, R. F., Astron. J., 72, 293 (1967).Google Scholar
Clement, M. h, Astrophys. J., 141, 1443 (1965).Google Scholar
Goldberg, B. A., Walker, G. A. H., and Odgers, G. J., Astron.Astrophys., 32, 355 (1974).Google Scholar
Goldberg, B. A., unpublished thesis, University of British Columbia (1973).Google Scholar
Ledoux, p., Astrophys. J., 114, 373 (1951).CrossRefGoogle Scholar
Osaki, Y., Pubi. Astron. Soc. Japan, 23, 485 (1971).Google Scholar