Résumé
Sometimes, in a collision or merger between a massive star and a neutron star, the neutron star might sink to the core of the massive star and form a Thorne-Zytkow Object (T(Z)over dotO). Massive T(Z)over dotOs (> 12 Mcircle dot) could appear as red supergiants enriched in exotic elements formed by proton capture (the p-process) in the unique nucleosynthetic environments just outside their degenerate cores. We performed a spectroscopic survey of 59 red supergiants to look for absorption lines of p-process elements-to search for T(Z)over dotOs. Our survey uncovered two stars, BD+55 388 and IO Per, that appear to be enriched in Rb, a possible signature of the p-process.