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Pulsation Modal Behavior of Classical Cepheids in the HR Diagram

Published online by Cambridge University Press:  14 August 2015

Arthur N. Cox  and
Stephen W. Hodson
Arthur N. Cox
Affiliation:
Los Alamos Scientific Laboratory
Stephen W. Hodson
Affiliation:
Los Alamos Scientific Laboratory

Extract

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Mapping of the Cepheid region of the Hertzsprung-Russell diagram has been difficult to do from a theoretical viewpoint because the masses and compositions of the Cepheids have always been very uncertain. It now appears that the various mass anomalies have been solved by distance scale changes and by the realization of very helium rich convection zones. This helium enrichment is caused by a Cepheid wind which blows away more hydrogen than helium, just as in the solar wind. Now with the evolutionary theory masses, radii, luminosities, and our new composition structures, the predicted blue edges of the instability strip and periods throughout the strip agree very well with observations.

Type
Part V: HR Diagrams, Horizontal Branch
Information
Symposium - International Astronomical Union , Volume 80: The HR Diagram , 1978 , pp. 237 - 240
Copyright
Copyright © Reidel 1978 

References

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