par Merle, Thibault ;Jorissen, Alain ;Van Eck, Sophie ;Masseron, Thomas ;Van Winckel, Hans
Référence The Physics of Evolved Stars: A Conference Dedicated to the Memory of Olivier Chesneau, Vol. 71, page (343-344)
Publication Publié, 2015-12
Publication dans des actes
Résumé : The enrichment of barium stars in s-process elements is known to be due to pollution by mass transfer from an asymptotic giant branch (AGB) companion star, now an extincted C-O white-dwarf (McClure et al. [4]; Gray et al. [1]). We investigate the relationship between the level of enrichment in s-process elements in the barium star and the mass of its white dwarf (WD) companion. It is expected that helium WDs, which have masses smaller than about 0.5 M⊙ and whose progenitor never reached the AGB phase, should not pollute with s-process elements their giant companion. That companion should thus never turn into a barium star. Our results conform to the expectation that binary systems with WD companions less massive than 0.5 M⊙ do not host barium stars.