The kinematical and space structures of IC 2391 open cluster and moving group with Gaia-DR2

TL;DR

This study uses Gaia-DR2 data to analyze the kinematics and spatial structure of the IC 2391 open cluster and its associated stellar stream, revealing their likely common origin despite current spatial separation.

Contribution

It provides a detailed kinematic and spatial analysis of IC 2391 and its stream, including orbit tracing and potential genetic relationship, using Gaia-DR2 data.

Findings

Ages and apex positions of the cluster and stream are consistent with previous studies.

The cluster and stream likely formed in the same Galactic disk region.

Current spatial separation does not imply different origins.

Abstract

The kinematical parameters, spatial shape and structure of the open cluster IC 2391 and the associated stellar stream are studied here using Gaia-DR2 (GDR2) astrometry data. The apex positions are determined for the open cluster IC 2391 (data taken from Cantat-Gaudin et al.) and for the kinematical streams stars mentioned in Montes et al. using both convergent point and AD-diagram methods. The values of apex coordinates identified. The results are in good agreement with the previously calculated values. The positions of the stars in the disk and the spatial dispersion velocities are determined. The paths of cluster and associated stream are traced in the disk by orbit calculation back in time to their places of formation. A possible genetic relationship between the cluster and the stream has been detected. The approximation of the spatial and kinematical shape of the stream and the cluster is made. According to this study, even though currently the cluster and the stream seem to have spatial difference in their locations but they appear to have formed in the same region of the Galactic disk.