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Abundance ratios & ages of stellar populations in HARPS-GTO sample

Published online by Cambridge University Press:  07 March 2018

E. Delgado Mena
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal. email: elisa.delgado@astro.up.pt
M. Tsantaki
Affiliation:
Instituto de Radioastronomía y Astrofísica, IRyA, UNAM, Campus Morelia, A.P. 3-72, C.P. 58089, Michoacán, Mexico
V. Zh. Adibekyan
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal. email: elisa.delgado@astro.up.pt
S. G. Sousa
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal. email: elisa.delgado@astro.up.pt Departamento de Física e Astronomía, Faculdade de Ciências, U. Porto, Portugal
N. C. Santos
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal. email: elisa.delgado@astro.up.pt Departamento de Física e Astronomía, Faculdade de Ciências, U. Porto, Portugal
J. I. González Hernández
Affiliation:
Instituto de Astrofísica de Canarias, C/ Via Lactea, s/n, 38205, La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
G. Israelian
Affiliation:
Instituto de Astrofísica de Canarias, C/ Via Lactea, s/n, 38205, La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
Corresponding
E-mail address:
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Abstract

In this work we present chemical abundances of heavy elements (Z>28) for a homogeneous sample of 1059 stars from HARPS planet search program. We also derive ages using parallaxes from Hipparcos and Gaia DR1 to compare the results. We study the [X/Fe] ratios for different populations and compare them with models of Galactic chemical evolution. We find that thick disk stars are chemically disjunt for Zn adn Eu. Moreover, the high-alpha metal-rich population presents an interesting behaviour, with clear overabundances of Cu and Zn and lower abundances of Y and Ba with respect to thin disk stars. Several abundance ratios present a significant correlation with age for chemically separated thin disk stars (regardless of their metallicity) but thick disk stars do not present that behaviour. Moreover, at supersolar metallicities the trends with age tend to be weaker for several elements.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

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