RR-LYRAE VARIABLES IN THE GLOBULAR-CLUSTER-M3 (NGC-5272) - 1 - BVI-CCD PHOTOMETRY

New BVI CCD photometry is presented for 60 RR Lyrae variables in the g lobular cluster M3. Light curves have been constructed and ephemerides have been (re)-derived for all of them. Four stars (i.e. V29, V136, V 155 and V209), although recognized as variables, had no previous perio d determinations. Also, the period derived for V129 is significantly d ifferent from the one published by Sawyer-Hogg. Light curve parameters , i.e. mean magnitudes, amplitudes and rise times, have been derived. The discussion of these results in the framework of the stellar evolut ion and pulsation theories will be presented in a forthcoming paper.