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When binaries keep track of recent nucleosynthesis

Published online by Cambridge University Press:  30 December 2019

D. Karinkuzhi Open the ORCID record for D. Karinkuzhi [Opens in a new window] ,
S. Van Eck ,
A. Jorissen ,
S. Goriely ,
L. Siess ,
T. Merle ,
A. Escorza ,
M. Van der Swaelmen ,
H. M. J. Boffin  and
T. Masseron
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D. Karinkuzhi
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium Dept. of Physics, Bangalore University, Bangalore, India. 560056.
S. Van Eck
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
A. Jorissen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
S. Goriely
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
L. Siess
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
T. Merle
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
A. Escorza
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
M. Van der Swaelmen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium
H. M. J. Boffin
Affiliation:
ESO, Karl-Schwarzschild-Straß e 2, D-85748 Garching bei München, Germany
T. Masseron
Affiliation:
Instituto de Astrofsica de Canarias, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofsica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
S. Shetye
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, ULB, Campus Plaine C.P. 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
B. Plez
Affiliation:
Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS, 34095, Montpellier Cedex 05, France emails: [email protected], [email protected]
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Abstract

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We determine Zr and Nb elemental abundances in barium stars to probe the operation temperature of the s-process that occurred in the companion asymptotic giant branch (AGB) stars. Along with Zr and Nb, we derive the abundances of a large number of heavy elements. They provide constraints on the s-process operation temperature and therefore on the s-process neutron source. The results are then compared with stellar evolution and nucleosynthesis models. We compare the nucleosynthetic profile of the present sample stars with those of CEMP-s, CEMP-rs and CEMP-r stars. One barium star of our sample is potentially identified as the highest-metallicity CEMP-rs star yet discovered.

Keywords

stars: AGBstars: binariesstars: abundances
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. 438 - 440
Copyright
© International Astronomical Union 2019 

References

Masseron, T., Johnson, J. A., Plez, B., Van Eck, S., Primas, F., Goriely, S., & Jorissen, A. 2010, A&A, 509, A93 Google Scholar
Masseron, T., Merle, T., & Hawkins, K., 2016, ascl, 1605.004Google Scholar
Neyskens, P., Van Eck, S., Jorissen, A., Goriely, S., Siess, S., Plez, B. 2015, nature, 517, 174 CrossRefGoogle Scholar
Raskin, G., van Winckel, H., Hensberge, H., Jorissen, A., Lehmann, H., Waelkens, Avila, G., de Cuyper, J.-P., et al. 2011, A&A, 526, A69 Google Scholar