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A Dynamical Study of Suspected Runaway Stars as Traces of Past Supernova Explosions in the Region of the Scorpius-Centaurus OB Association
We address the question of identifying possible past supernovae eventstaking place in the region of the Scorpius-Centaurus (Sco-Cen) OBassociation based on stars proposed by Hoogerwerf et al. With thispurpose, we obtained a time series of high-resolution spectra of sixstars (HIP 42038, HIP 46950, HIP 48943, HIP 69491, HIP 76013, and HIP82868) which, according to Hoogerwerf et al., may have been runawaystars with origins in the region of the Sco-Cen association. This alsoincludes the nearby young open clusters IC 2391 and IC 2602. Ifconfirmed, such supernovae events could, in principle, have played arole in triggering the formation of some small stellar groups thought tobe associated with the Sco-Cen association. Our analysis shows that,except for HIP 48943, the remaining stars are spectroscopic binarysystems. For HIP 46950 and HIP 69491, this was already noted by otherauthors. Our high-resolution spectra allowed us to obtain the radialvelocities for all the stars which, combined with their proper motionsand parallaxes from Hipparcos, provide a means to investigate, byretracing their orbits, if the Sco-Cen region was, in fact, the originof these stars. We find that none of these systems originated in theSco-Cen region. Exploring the possibility that the birthplace of thestudied stars occurred in the clusters IC 2391 and IC 2602, we noticedthat at the epoch of 2-3 Myr ago these clusters were at a distancecomparable with their tidal radii.
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