A study of the photometric system of the Kiev network telescope

Abstract

We performed a series of CCD observations in BVRI bands of a celestial region in cluster M67 (NGC 2682) to study the photometric system of the Kyiv network telescope. The signal recording system consists of a CGE-1400 telescope, Celestron #94175 focal reducer, an automatic turret with a set of UBVRI filters, and a Rolera Mgi CCD camera. The operating field of the system is 10.62' × 10.62'. CCD images are processed in the MIDAS/ROMAFOT package. The reduction coefficients of the instrumental photometric system relative to Johnson's BVRI system are determined. The resulted value of the module of distance to cluster M67 V ‑ M_V = 9.63^m does not contradict the results of other researchers. The mean square errors for one determination of stellar magnitude for different bands are 0.02–0.12^m. The errors in determining equatorial coordinates in the TYCHO-2 catalog system are ± 1″.