The composition of Barium stars and the s-process in AGB stars

Borbála Cseh, Maria Lugaro, Valentina D'Orazi, Denise B. De Castro, Claudio B. Pereira, Amanda I. Karakas, László Molnár, Emese Plachy, Róbert Szabó, Marco Pignatari, Sergio Cristallo

Research output: Contribution to journalArticle

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 13C is the main neutron source and is in agreement with Kepler asteroseismology observations.

Original languageEnglish
Pages (from-to)89-92
Number of pages4
JournalProceedings of the International Astronomical Union
DOIs
Publication statusAccepted/In press - 2019

Keywords

  • Stars: Abundances
  • abundances
  • nuclear reactions
  • nucleosynthesis
  • stars: AGB and post-AGB

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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    Cseh, B., Lugaro, M., D'Orazi, V., De Castro, D. B., Pereira, C. B., Karakas, A. I., Molnár, L., Plachy, E., Szabó, R., Pignatari, M., & Cristallo, S. (Accepted/In press). The composition of Barium stars and the s-process in AGB stars. Proceedings of the International Astronomical Union, 89-92. https://doi.org/10.1017/S1743921318005100