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Fundamental Temperatures and Surface Gravities for HB Stars in the Field and in Globular Clusters

Published online by Cambridge University Press:  14 August 2015

A.G. Davis Philip
Affiliation:
Dudley Observatory and Union College
D. S. Hayes
Affiliation:
Kitt Peak National Observatory

Extract

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Scans have been made of ten BHB stars in the globular clusters M92, M13 and M5 and of eight stars in 1 HLF 2 with the multi-channel spectrometer on the Hale 5 meter telescope during July 1979. Twenty-four additional stars are being scanned at CTIO and KPNO using the Harvard scanner. Four-color observations were made of most of the BHB stars on the Steward Observatory 90″ telescope and these measures indicated that there were stars, at the same (b-y) color on the horizontal branch, with quite different values of the c1 index. The scans confirm these results, showing that the shape of the intensity vs wavelength curve for λ<4210 is related to the c1 index. These features are illustrated in the two figures, where it can be seen that a c1 value formed from the scans [(u-v)-(v-b)] is greater for the star in Figure 1.

Type
August 30 Globular Clusters
Copyright
Copyright © Reidel 1980 

References

Relyea, L.J. and Kurucz, R.L.: 1978, Ap. J. Suppl. 37, 45.CrossRefGoogle Scholar