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The Influence of Rotation on Horizontal Branch Stars and on RR Lyrae Pulsational Properties

Published online by Cambridge University Press:  14 August 2015

V. Castellani
V. Castellani*
Affiliation:
Istituto Astrofisica Spaziale, Frascati University of Rome

Extract

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The occurrence of rotation in Globular Cluster stars has been suggested (see e.g. Renzini 1977) as a mechanism producing the observed colour spread in actual Horizontal Branches. If this is the case, canonical results on evolutionary properties of HB stars have to be revisited in order to account for rotation-driven structural variations: faster Main Sequence rotators delay the He flash increasing the mass-size Mc of the He core at the flash and loosing a greater amount of mass during the Red Giant stage.

Type
Session 6: Effect of Rotation and Magnetic Field in Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 93: Fundamental Problems in the Theory of Stellar Evolution , 1981 , pp. 275
Copyright
Copyright © Reidel 1981 

References

Castellani, V., Ponte, G., Tornambè, A.: Astrophys. Space Sci (in publ.) Google Scholar
Castellani, V., Tornambè, A.: 1980, Astron. & Astrophys. (in publ.) Google Scholar
Iben, I. Jr: 1968, Nature 220, 143 Google Scholar
Renzini, A.: 1977, Proceedings of “Saas-Fee”, 7th Advanced Course.Google Scholar