A deep study of an intermediate age open cluster SAI 35 (Juchert 20) using ground based imaging and Gaia EDR3 astrometry

TL;DR

This study provides a comprehensive analysis of the intermediate age open cluster SAI 35 using ground-based photometry, Gaia astrometry, and other surveys to determine its properties, membership, and orbital dynamics.

Contribution

It is the first detailed CCD photometric and astrometric study of SAI 35, combining multiple data sources to derive its physical and dynamical parameters.

Findings

Cluster age estimated at 360 Myr.

Distance determined as 2.9 kpc.

Mass function slope consistent with Salpeter's value.

Abstract

We present CCD $UBVI$ photometric study of poorly studied intermediate age open cluster SAI 35 (Juchert 20) for the first time. To accomplish this study, we also used LAMOST DR5, 2MASS, and Gaia EDR3 databases. We identified 214 most probable cluster members with membership probability higher than 50%. The mean proper motion of the cluster is found as \mu_{\alpha}cos\delta=1.10 \pm 0.01 and \mu_{\delta}=-1.66 \pm 0.01 mas/yr. We find the normal interstellar extinction law using the various two-color diagrams. The age, distance, reddening, and radial velocity of the cluster are estimated to be 360 \pm 40 Myr, 2.9 \pm 0.15 kpc, 0.72 \pm 0.05 mag and -91.62 \pm 6.39 km/sec. The overall mass function slope for main-sequence stars is found to be 1.49\pm0.16 within the mass range 1.1-3.1 M_\odot, which is in agreement with Salpeter's value within uncertainty. The present study demonstrates that SAI 35 is a dynamically relaxed. Galactic orbital parameters are determined using Galactic potential models. We found that this object follows a circular path around the Galactic center.