Research Papers in Physics and Astronomy

 

Date of this Version

6-6-1978

Document Type

Article

Citation

Astron. Astrophys. 75, 140-148 (1979).

Comments

Copyright 1976 European Southern Observatory

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 (P1/P0) 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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