Variable stars in the globular cluster M15
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Date
2006
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Abstract
We present new BV CCD photometry for variables in the globular cluster M15. The photometry used was obtained with the image subtraction package ISIS. The data were acquired on an observing run in 2001 and range over 11 observing nights. For 32 previously known variables, we obtained period for the first time. Improved periods were obtained for 28 previously known variables, and 13 new variables were found. For some of the variables intensity- and magnitude-averaged B and V magnitudes, magnitude-averaged colors, and pulsation amplitudes were obtained using DAOPHOT to calibrate the ISIS light curves.