A comprehensive photometric and kinematical characteristic of the newly discovered QCs clusters with Gaia EDR3

TL;DR

This paper provides a detailed astrometric, photometric, and kinematical analysis of four newly discovered open clusters using Gaia EDR3 data, revealing their structural, evolutionary, and dynamical properties.

Contribution

It offers the first comprehensive characterization of these clusters, including membership, structure, age, metallicity, mass, and dynamical state, using Gaia EDR3 data and advanced analysis methods.

Findings

All clusters are dynamically relaxed except QC1.

Distances are consistent with Gaia astrometry within 85%.

Clusters have ages between 10^6.987 and 10^8.858 years.

Abstract

This study reports the first comprehensive astrometric, photometric and kinematical analysis of four newly discovered open clusters; namely QC1, QC2, QC3, and QC4, using astrometric and photometric data from the most recent Gaia EDR3 for G<17 mag. Utilizing the ASteCA code, we identified the most probable (P>=50%) star candidates and found the numbers of star members (N) to be 118 (QC1), 142(QC2), 210 (QC3), and 110 (QC4). By fitting King's density profile to the cluster's RDPs, we found the internal structural parameters of each cluster such as the cluster radii that are in the range 7.00 to 11.00arcmin. For each cluster we constructed the CMD and by fitting them with suitable isochrones we found that the metallicity range is (0.0152-0.0199) which is in line with the Solar value, the logarithmic age (in yrs) range between 6.987 and 8.858. The distances derived from CMD are 1674+/-41, 1927+/-44, 1889+/-43,and 1611+/-40 (pc) for QC1, QC2, QC3, and QC4, respectively, and they are in good agreement up to 85% with the values obtained from the astrometric data. In addition, from the MLR of the clusters, we obtained a total mass, M_C in Solar units, of 158, 177, 232, and 182 and an absolute magnitude MG(mag)of 4.33, 3.80, 4.25, and 4.10 for QC1, QC2, QC3, and QC4, respectively. The dynamical analysis and evolution parameters of the cluster members indicated that all the four clusters are dynamically relaxed;except QC1 which has an evolution parameter tau=0.82 that indicates a dynamical activity within the cluster. From the kinematical analysis of the cluster data, we computed the space velocity, the coordinates of the apex point (A,D) using the AD-diagram method, as well as the Solar elements (S_sun, l_A, b_A,alpha_A,delta_A)