Are Some Chemically Peculiar Stars that Show Strong Overabundances of Very Heavy Elements Related to Supernovae?

Abstract

For many years, detailed observational and statistical study of the chemically peculiar stars showed that the presence of heavy radioactive chemical elements overabundances in their atmospheres are not well understood. We try to explain the overabundance of a few of them by the explosion of the possible supernovae in binary or multiple stellar system, i.e. to search for a chemically peculiar star and pulsar pair by traceback motion study in the Galaxy. We analyzed trajectories of 529 chemically peculiar stars of our sample and 28 pulsars from ATNF catalogue, which ages do not exceed 100 Myr, and obtained several possible candidate pairs (CP star plus pulsar), which may have been at the same place at the same time. Moreover, our traceback study of them with the young stellar clusters (Hunt and Reffert, 2023) led to the identification of several, possibly, parental stellar groups. Furthermore, more detailed studies are needed to estimate the ages of chemically peculiar stars and detect their locations of formation, as well as use statistical methods to assess whether the possible supernova ejection is the result of coincidence or not. Obviously, modeling of the best chemically peculiar star-pulsar pairs will also allow us to explain the processes occurring in these stars.