Journal article
PHOTOMETRIC CALIBRATION IN THE METAL-RICH GLOBULAR CLUSTER M69.
Abstract
Photoelectric BV photometry is reported for sequence stars in the field of NGC 6637, a globular cluster of relatively high heavy-element abundance. The data are used to recalibrate the photographic color-magnitude (CM) diagram by Hartwick and Sandage (1968) for the cluster. Considerable systematic corrections to the previous photographic photometry are found to be needed in both V and (B - V), in the sense that the giant branch becomes both …
Authors
Harris WE
Journal
Publications of the Astronomical Society of the Pacific, Vol. 89, No. 530, pp. 482–484
Publisher
IOP Publishing
Publication Date
August 1977
DOI
10.1086/130148
ISSN
1538-3873