Double mode pulsation as a resonance phenomenon

Details Double mode pulsation as a resonance phenomenon Double mode pulsation as a resonance phenomenon

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..140s&link_type=abstract

Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 140-148. Research supported by the University of Nebraska and Univer

Astronomy and Astrophysics

Astrophysics

34

Cepheid Variables, Stellar Models, Resonance, Stellar Mass, Stellar Radiation, Stellar Spectra

Scientific paper

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.

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