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

Published online by Cambridge University Press:  30 December 2019

Borbála Cseh ,
Maria Lugaro ,
Valentina D’Orazi ,
Denise B. de Castro ,
Claudio B. Pereira ,
Amanda I. Karakas ,
László Molnár Open the ORCID record for László Molnár [Opens in a new window] ,
Emese Plachy ,
Róbert Szabó  and
Marco Pignatari
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Borbála Cseh
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected]
Maria Lugaro
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected] Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC 3800, Australia
Valentina D’Orazi
Affiliation:
INAF Osservatorio Astronomico di Padova, Vicolo dellOsservatorio 5, 35122 Padova, Italy
Denise B. de Castro
Affiliation:
Department for Astrophysics, Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland
Claudio B. Pereira
Affiliation:
Observatorio Nacional, Rua General José Cristino, 77 Sao Cristovao, Rio de Janeiro, Brazil
Amanda I. Karakas
Affiliation:
Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC 3800, Australia
László Molnár
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected] MTA CSFK Lendület Near-Field Cosmology Research Group
Emese Plachy
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected] MTA CSFK Lendület Near-Field Cosmology Research Group
Róbert Szabó
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected] MTA CSFK Lendület Near-Field Cosmology Research Group
Marco Pignatari
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary email: [email protected] E. A. Milne Centre for Astrophysics, Department of Physics & Mathematics, University of Hull, HU6 7RX, United Kingdom The NuGrid Collaboration, http://www.nugridstars.org Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements, USA
Sergio Cristallo
Affiliation:
INAF, Osservatorio Astronomico d’Abruzzo, I-64100 Teramo, Italy INFN-Sezione di Perugia, I-06123 Perugia, Italy
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Abstract

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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.

Keywords

stars: abundancesnuclear reactionsnucleosynthesisabundancesstars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 89 - 92
Copyright
© International Astronomical Union 2019 

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