Open Cluster Evolutions in Binary System: How They Dissolved

TL;DR

This paper investigates the evolution and dissolution of binary star clusters through N-body simulations, revealing how mergers influence their mass loss, rotation, and interaction with external tidal forces.

Contribution

It provides new insights into the post-merger evolution of binary clusters, highlighting the effects of angular momentum and external tides on their dissolution.

Findings

Merged clusters have higher mass-loss rates due to angular momentum.

Rotating clusters experience greater deceleration from external tidal fields.

Binary cluster mergers alter spatial distribution and kinematics of stellar members.

Abstract

Binarity among stellar clusters in galaxy is such a reality which has been realized for a long time, but still hides several questions and problems to be solved. Some of binary star clusters are formed by close encounter, but the others are formed together from similar womb. Some of them undergo separation process, while the others are in the middle of merger toward common future. The products of merger binary star cluster have typical characteristics which differ from solo clusters, especially in their spatial distribution and their stellar members kinematics. On the other hand, these merger products still have to face dissolving processes triggered by both internal and external factors. In this study, we performed N-body simulations of merger binary clusters with different initial conditions. After merging, these clusters dissolve with greater mass-loss rate because of their angular momentum. These rotating clusters also experience more deceleration caused by external tidal field.