CCD PHOTOMETRY IN THE UBVR SYSTEM IN THE REGION OF NGC 6913 CLUSTER

CCD observations of a sky area in the NGC 6913 cluster were made in the U B V Johnson system with the two-meter telescope of the Terskol Peak Observatory, the Northern Caucasus, Russia. We derived magnitudes and positions for stars down to V = 20(m) for a sky area of 7' x 5' arcmin. The instrumental photometric system is determined with respect to the U B V Johnson system. From the observations, we obtained a new value of the distance module V - M-V = 13.8(m) as well as the value the reddening E(U - B) = E(B - V) = 0.7/0.9. The procedure for reducing CCD frames is briefly described which is realized in the LINUX/MIDAS/ROMAFOT on the basis determination. The rms error is +/- 0.02(m) - 0.03(m) for magnitude determination.