CCD UBV(RI)KC Photometry of the Open Clusters Juchert 9 and Berkeley 97

TL;DR

This study presents CCD UBV(RI)KC photometry and analysis of two poorly studied open clusters, determining their reddenings, distances, and ages, and confirming results with Gaia DR2 data.

Contribution

The paper provides new photometric data and detailed parameter estimates for Juchert 9 and Berkeley 97, including reddening, distance, and age, using CCD photometry and Gaia data.

Findings

Reddenings: E(B-V)=0.82 for Juchert 9, 0.87 for Berkeley 97.

Distances: ~4.8 kpc for Juchert 9, ~3.0 kpc for Berkeley 97.

Ages: 30 Myr for Juchert 9, 100 Myr for 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 M\'artir National Observatory, M\'exico has been analysed. 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) colour are (Vo-Mv , 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 relative parallaxes < 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.