Analysis of Selected Runaway Stars in the Orion Nebula Based on Data from the Gaia EDR3 Catalogue

TL;DR

This study uses Gaia EDR3 data and Monte Carlo simulations to analyze the origins and trajectories of runaway stars in the Orion Nebula, confirming some hypotheses about their formation and escape from clusters.

Contribution

It provides new insights into the dynamical history of specific runaway stars and their association with the Orion Trapezium cluster using Gaia data and simulations.

Findings

Confirmed the origin of AE Aur and μCol from the Orion Trapezium about 2.5 Myr ago.

Identified close encounters and escape probabilities for several stars from the Orion region.

First estimation of binary breakup probability for specific Gaia EDR3 stars.

Abstract

We have performed Monte Carlo simulations of the trajectories of several runaway stars using their parallaxes and proper motions from the Gaia EDR3 catalogue. We have confirmed the hypothesis that the stars AE Aur and $\mu$Col are a product of the multiple system breakup $\sim$2.5 Myr ago and the Orion Trapezium may be the parent cluster for this pair of stars. We show that the data from the Gaia EDR3 catalogue for the star $\iota$Ori, mainly the parallax, do not allow us to talk about the breakup of the multiple system of AE Aur, $\mu$Col, and $\iota$Ori. The existence of close pair encounters between the stars HD 30112 and HD 43112 $\sim$1 Myr ago has been confirmed. Close triple encounters confirm the hypothesis that the stars HD 30112 and HD 43112 escaped from the parent cluster Col 69. We show that the stars HIP 28133 and TYC 5368-1541-1 have a nonzero probability of escape from the region within 10 pc of the center of the Orion Trapezium cluster and a fairly high probability (about 8\%) that they were both at distances less than 20 pc from the center of the Orion Trapezium $\sim$2.5 Myr ago. It has been established for the first time that the stars Gaia EDR3 3021115184676332288 and Gaia EDR3 2983790269606043648 have a probability of about 0.5\% that they broke up as a binary system $\sim$1.1 Myr ago. The star Gaia EDR3 3021115184676332288 has a probability of about 16\% that it escaped from the region within 10 pc of the center of the Orion Trapezium cluster $\sim$1 Myr ago.