CCD UBV(RI)(KC) photometry of the open clusters Juchert 9 and Berkeley 97

Abstract

The CCD UBV(RI)(KC) photometry of the poorly studied open clusters Juchert 9 (Juc 9) and Berkeley 97 (Be 97), which are observed with the 0.84 m telescope at the San Pedro Martir National Observatory, Mexico has been analyzed. For the likely cluster members, we determined the reddenings, E(B-V) = 0.82 +/- 0.04 (Juc 9) and E(B-V) = 0.87 +/- 0.05 (Be 97), from the early type stars. Our distance moduli/distances for only (B - V) color are (V-0-M-V,M- d[kpc]) = (13.40 +/- 0.10, 4.8 +/- 0.2 kpc) (Juc 9) and (12.40 +/- 0.12, 3.0 +/- 0.2 kpc) (Be 97), respectively. The Gaia DR2 distances are d = 4.5 +/- 1.2 kpc (Juc 9) and d = 3.1 +/- 0.7 kpc (Be 97) from the median parallaxes with sigma(& x3d6;)/& x3d6; < 0.20, which are in good agreement with the photometric distances within the uncertainties. The solar abundance PARSEC isochrones give us the intermediate ages, 30 +/- 10 Myr for Juc 9 and 100 +/- 30 Myr for Be 97.