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When binaries keep track of recent nucleosynthesis

Published online by Cambridge University Press:  30 December 2019

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.

Type
Contributed Papers
Copyright
© International Astronomical Union 2019 

References

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