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RR Lyrae Stars and Stellar Evolution in the Globular Cluster M 15

We present lightcurves for 30 RR Lyrae variable stars identified in the globular cluster M15 using observations recorded at the University of Rochester’s C.E.K. Mees Observatory. The periods of the variables are compared to observations of the brightest RR Lyrae star, RR Lyrae itself, whose proximity is such that its distance is accurately determined by parallax measurements. From this we estimate the distance to M15 to be 9000 ± 370 pc. Further, we perform photometry for the stars in the cluster in three wavelength bands and present a HR diagram of M15. We discuss the evolution of the stellar members of M15 by comparison of the HR diagram to that of nearby stars.