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Horizontal-Branch Stars by Strong HE Lines

Published online by Cambridge University Press:  19 July 2016

Deborah A. Crocker  and
Robert T. Rood
Deborah A. Crocker
Affiliation:
University of Virginia
Robert T. Rood
Affiliation:
University of Virginia

Abstract

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We discuss observations of He lines at λ 4026 å in two stars in NGC 6752 and three in M 92. M 92 and NGC 6752 are moderate to extreme second parameter clusters. The presence of He lines in stars where diffusion should deplete atmospheric helium may be a clue to the identity of the second parameter. One such candidate which could easily inhibit diffusion is rotation.

Type
Chapter VII. Poster Papers on Harlow Shapley and Globular Clusters in the Milky Way
Information
Symposium - International Astronomical Union , Volume 126: The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies , 1988 , pp. 509 - 510
Copyright
Copyright © Kluwer 1988 

References

REFERENCES

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