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A New Possible Resonance for Population II Cepheids

Published online by Cambridge University Press:  12 April 2016

A. N. Cox  and
R. B. Kidman
A. N. Cox
Affiliation:
Theoretical Division, Los Alamos National Laboratory, University of California
R. B. Kidman
Affiliation:
Theoretical Division, Los Alamos National Laboratory, University of California

Extract

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Light and velocity curves of some radial mode variable stars seem to indicate a resonance where the second overtone has a period exactly half that of the fundamental mode. The two classes of stars that show this resonance by bumps in their light curves are the classical Cepheids and the population II BL Her variables. We here propose that there is another resonance for the population II W Vir variables where the ratio of the first overtone to the fundamental periods is 0.5.

Type
Part IV. Population II Cepheids
Information
International Astronomical Union Colloquium , Volume 82: Cepheids: Theory and Observations , 1985 , pp. 250 - 253
Copyright
Copyright © Cambridge University Press 1985

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