Variable stars in the globular cluster M5: application of the image subtraction method

We present V-band light curves of 61 variables from the core of the globula r cluster M5 obtained using a newly developed image subtraction method (ISM ). Four of these variables were previously unknown. Only 26 variables were found in the same field using photometry obtained with DOPHOT software. Fou rier parameters of the ISM light curves have relative errors up to 11 times smaller than parameters measured from DOPHOT photometry. We conclude that the new method is very promising for searching for variable stars in the co res of the globular clusters and gives very accurate relative photometry wi th quality comparable to photometry obtained by the Hubble Space Telescope. We also show that the variable V104 is not an eclipsing star as has been s uggested, but is an RRc star showing non-radial pulsations.