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One Micron Photometry of Omega Centauri Giants

Published online by Cambridge University Press:  19 July 2016

Graeme H. Smith
Graeme H. Smith*
Affiliation:
Dominion Astrophysical Observatory Herzberg Institute of Astrophysics

Extract

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The globular cluster ω Centauri is known to be chemically inhomogeneous, a property that reveals itself via a wide giant branch in the V, B-V color-magnitude diagram (Cannon and Stobie 1973). Typically a color range of δ(B-V) = 0.3 − 0.4 exists among giants with V < 13. However, in the red R, R-I (Norris and Bessell 1975, Bessell and Norris 1976), and I, V-I (Lloyd Evans 1977) diagrams a much tighter giant branch is seen. This has lead to the suggestion (e.g. Bessell and Norris 1976) that molecular absorption in the bandpass of the B filter has significantly reddened the B-V color, and thereby produced an anomalously wide giant branch.

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. 503 - 504
Copyright
Copyright © Kluwer 1988 

References

REFERENCES

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