Double mode pulsation as a resonance phenomenon.
Abstract
It is proposed that the maintenance of stable double-mode pulsation involves a resonant interaction between the two excited modes. This hypothesis yields a simple explanation of the narrow range of period ratio observed in both the double-mode Cepheids and the double-mode AI Velorum stars. The resonance idea is consistent with the under-massive models previously invoked to match the double-mode Cepheids, but seems to rule out normal Population I masses for the AI Velorum stars. It is argued that observational evidence regarding the pulsations of the AI Vel objects does not at present preclude the latter result.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1979
- Bibcode:
- 1979A&A....75..140S
- Keywords:
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- Cepheid Variables;
- Stellar Models;
- Resonance;
- Stellar Mass;
- Stellar Radiation;
- Stellar Spectra;
- Astrophysics;
- AI Velorum Stars:Pulsation Theory