1 Isaac Newton Institute of Chile in Eastern Europe and Eurasia Casilla 8-9, Correo 9, Santiago, Chile e-Mail:
[email protected] Web-address: www.ini.cl ͓S0002-7537͑95͒03301-4͔ The Isaac Newton Institute, ͑INI͒ for astronomical re- and luminosity functions ͑LFs͒ of the cluster Main Sequence search was founded in 1978 by the undersigned. The main ͑MS͒ for two fields extending from a region near the center office is located in the eastern outskirts of Santiago. Since of the cluster out to Ӎ 10 arcmin. The photometry of these 1992, it has expanded into several countries of the former fields produces a narrow MS extending down to VӍ27, Soviet Union in Eastern Europe and Eurasia. much deeper than any previous ground based study on this As of the year 2003, the Institute is composed of fifteen system and comparable to previous HST photometry. The V, Branches in nine countries ͑see figure on following page͒. V-I CMD also shows a deep white dwarf cooling sequence These are: Armenia ͑19͒, Bulgaria ͑28͒, Crimea ͑35͒, Kaza- locus, contaminated by many field stars and spurious objects. khstan ͑18͒, Kazan ͑12͒, Kiev ͑11͒, Moscow ͑23͒, Odessa We concentrate the present work on the analysis of the ͑35͒, Petersburg ͑33͒, Poland ͑13͒, Pushchino ͑23͒, Special MSLFs derived for two annuli at different radial distance Astrophysical Observatory, ‘‘SAO’’ ͑49͒, Tajikistan ͑9͒, from the center of the cluster. Evidence of a clear-cut corre- Uzbekistan ͑24͒ and Yugoslavia ͑23͒. The quantities in pa- lation between the slope of the observed LFs before reaching rentheses give the number of scientific staff, the grand total the turn-over, and the radial position of the observed fields of which is 355 members.