Qebeh-Senuef Cluster

The Qebeh-Senuef cluster is one of the largest, most populous "blue globular clusters" of the Bacterian Home Galaxy. A C-M diagram to V = 21.5 shows a main sequence extending up to V = 18.5 and a well-developed giant branch. Fitting to evolutionary models leads to an age estimate of 300 million years and the giants' colors suggest that [M/H] ~ — 1.0. Spectra of three cluster stars are shown. One is for one of the "anomalous giants". The spectrum of the cluster shows the dominance of the hot main sequence in the integrated light. Also known as SL 227 in some star charts.