Bibcode
Delgado Mena, E.; Tsantaki, M.; Zh. Adibekyan, V.; Sousa, S. G.; Santos, N. C.; González Hernández, J. I.; Israelian, G.
Referencia bibliográfica
Astrometry and Astrophysics in the Gaia sky, Proceedings of the International Astronomical Union, IAU Symposium, Volume 330, pp. 156-159
Fecha de publicación:
4
2018
Número de citas
6
Número de citas referidas
5
Descripción
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.