The composition of Barium stars and the s-process in AGB stars. Issue Volume 14:Issue S343(2019) (August 2018)

• Record Type: Journal Article
• Authors: Cseh, Borbála; Lugaro, Maria; D'Orazi, Valentina; de Castro, Denise B.; Pereira, Claudio B.; Karakas, Amanda I.; Molnár, László; Plachy, Emese; Szabó, Róbert; Pignatari, Marco; Cristallo, Sergio
• Editors: Kerschbaum, Franz; Groenewegen, Martin; Olofsson, Hans
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S343(2019)
• Page Start: 89
• Page End: 92
• Publication Date: 2018-08
• Subjects: stars: abundances, -- nuclear reactions, -- nucleosynthesis, -- abundances, -- stars: AGB and post-AGB; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921318005100
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: Using abundances from the available largest, homogeneous sample of high resolution Barium (Ba) star spectra we calculated the ratios of different hs-like to ls-like elemental ratios and compared to different AGB nucleosynthesis models. The Ba star data show an incontestable increase of the hs-type/ls-type element ratio (for example, [Ce/Y]) with decreasing metallicity. This trend in the Ba star observations is predicted by low mass, non-rotating AGB models where 13 C is the main neutron source and is in agreement with Kepler asteroseismology observations.