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Four-Color Measures of BHB Stars in M 4, M 13 and M 55

Published online by Cambridge University Press:  19 July 2016

A. G. Davis Philip
A. G. Davis Philip*
Affiliation:
Van Vleck Observatory and Union College

Extract

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Strömgren four-color photometric measures have been made of blue horizontal-branch A stars in the globular clusters M 4, M 13 and M 55 with the Steward Observatory 90 inch telescope and with the 60 inch telescope at Cerro Tololo Inter-American Observatory. These stars are faint, ranging in V magnitude from 13.6 in M 4 to 15.5 in M 13 and the corresponding errors in the four-color indices are ± 0.04 to 0.06 in the c1 index, for one observation. The error of the mean value of the c1 indices is approximately ± 0.02 for most of the stars since they have been measured from 4 to 10 times each.

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. 513 - 514
Copyright
Copyright © Kluwer 1988