New Radial Velocities for 30 Candidate Runaway Stars and a Possible Binary Supernova Origin for HIP 9470 and PSR J0152-1637

TL;DR

This study provides new radial velocity data for 30 candidate runaway stars, revises their ages, traces their origins, and suggests a supernova ejection scenario for HIP 9470, also identifying several spectroscopic binaries.

Contribution

It offers the first radial velocity measurements for these stars, identifies new spectroscopic binaries, and proposes a supernova origin for HIP 9470 and its possible link to a pulsar.

Findings

Seven stars are younger than ~100 Myr.

Five stars may have formed in young clusters.

HIP 9470 may have been ejected by a supernova and linked to PSR J0152-1637.

Abstract

We report new radial velocity measurements for 30 candidate runaway stars. We revise their age estimates and compute their past trajectories in the Galaxy in order to determine their birthplaces. We find that seven of the stars could be younger than ~100 Myr, and for five of them we identify multiple young clusters and associations in which they may have formed. For the youngest star in the sample, HIP 9470, we suggest a possible ejection scenario in a supernova event, and also that it may be associated with the young pulsar PSR J0152-1637. Our spectroscopic observations reveal seven of the stars in the sample of 30 to be previously unknown spectroscopic binaries. Orbital solutions for four of them are reported here as well.