Nonlinear effects in double-mode Cepheids
The effects of nonlinear mode interaction and period shifts in observed double-mode Cepheids are investigated with a detailed analysis of a mixed-mode pulsation model. Derived periods and mean constituent light curves agree well with the pure-mode nonlinear results and with the linear periods. Complete stability analyses indicate that low-mass Cepheid models show aperiodic mixed- mode behavior near the red edge of the instability strip, as well as a mode switch near the center of the strip. It is proposed that these cases could be distinguished observationally, although available evidence favors the stable mixed-mode configuration for known double-mode Cepheids. These results are consistent with a mass for these objects that is much smaller than the expected Cepheid mass for the observed period range.
- Research Organization:
- Department of Astronomy, Columbia University, NY
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-001512
- OSTI ID:
- 4141478
- Journal Information:
- Astrophys. J., v. 199, no. 3, pp. 705-709, Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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