Escaping stars from young low-N clusters

TL;DR

This study uses N-body simulations to analyze how young low-N star clusters lose stars before gas expulsion, revealing significant star escape with high velocities that affect interpretations of star formation environments.

Contribution

It provides new insights into star escape mechanisms in low-N clusters prior to gas expulsion, considering various initial conditions and binary populations.

Findings

Clusters can lose up to 20% of stars within 5 Myr.

Escaping stars can reach velocities over 100 km/s.

Stars travel 2-30 pc in 5 Myr, affecting star formation interpretations.

Abstract

With the use of N-body calculations the amount and properties of escaping stars from low-N (N = 100 and 1000) young embedded star clusters prior to gas expulsion are studied over the first 5 Myr of their existence. Besides the number of stars also different initial radii and binary populations are examined as well as virialised and collapsing clusters. It is found that these clusters can loose substantial amounts (up to 20%) of stars within 5 Myr with considerable velocities up to more than 100 km/s. Even with their mean velocities between 2 and 8 km/s these stars will still be travelling between 2 and 30 pc during the 5 Myr. Therefore can large amounts of distributed stars in star-forming regions not necessarily be counted as evidence for the isolated formation of stars.