Dynamical evolution modeling of the Collinder 135 & UBC 7 binary star cluster

TL;DR

This study uses detailed N-body simulations with Gaia data to investigate the dynamical evolution of the binary star clusters Collinder 135 and UBC 7, suggesting a common origin.

Contribution

It provides the first star-by-star N-body simulation of these clusters using realistic stellar evolution and Gaia data, confirming their likely binary nature and common origin.

Findings

Clusters are probably a binary system with a shared origin.

Simulations show good agreement with observational data.

The study demonstrates the effectiveness of Gaia-based N-body modeling.

Abstract

The purpose of the present work is a detailed investigation of the dynamical evolutionof Collinder 135 and UBC 7 star clusters. We present a set of dynamical numerical simulationsusing realistic star clusterN-body modeling technique with the forward integration of thestar-by-star cluster models to the present day, based on best-available 3D coordinates and velocitiesobtained from the latest Gaia EDR3 data release. We have established that Collinder 135 and UBC 7 are probably a binary star cluster and have common origin. We carried out a full star-by-star N-body simulation of the stellar population of both clusters using the new algorithm of Single Stellar Evolution and performed a comparison of the results obtained in the observational data (like cumulative number counts), which showed a fairly good agreement.