Resonance effects and the Cepheid ''bump mass'' anomaly
Journal Article
·
· Astrophys. J.; (United States)
A second-order iterative nonlinear pulsation theory is generalized to the nonadiabatic case, and employed to treat Cepheid models with linear normal-mode periods lying in the vicinity of the resonance P/sub 2//P/sub 0/=0.5. It is shown that resonance effects occurring in the second-order terms influence the phases at which maxima appear on the theoretical velocity curves. Comparision of the iterative velocity curves with those given by hydrodynamic integration indicates good agreement in a sizable number of cases. Discrepancies which appear in a number of models are discussed. It is argued that the results of the present investigation strengthen the case for associating the bumps on Cepheid velocity curves with the resonance P/sub 2//P/sub 0/=0.5. A brief discussion of the Cepheid ''bump mass'' anomaly concludes the article.
- Research Organization:
- Behlen Laboratory of Physics and Behlen Observatory, University of Nebraska, Lincoln
- OSTI ID:
- 7281955
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 217:1; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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