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https://doi.org/10.48550/arxiv...
Article . 2017
License: arXiv Non-Exclusive Distribution
Data sources: Datacite
Astronomy and Astrophysics
Article . 2017 . Peer-reviewed
Data sources: Crossref
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Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program

II. Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Eu⋆⋆⋆
Authors: E. Delgado Mena; M. Tsantaki; V. Zh. Adibekyan; S. G. Sousa; Nuno C. Santos; J. I. González Hernández; Garik Israelian;

Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program

Abstract

To understand the formation and evolution of the different stellar populations within our Galaxy it is essential to combine detailed kinematical and chemical information for large samples of stars. We derive chemical abundances of Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd and Eu for a large sample of more than 1000 FGK dwarf stars with high-resolution ($R \sim$\,115000) and high-quality spectra from the HARPS-GTO program. The abundances are derived by a standard Local Thermodinamyc Equilibrium (LTE) analysis using measured Equivalent Widths (EWs) injected to the code MOOG and a grid of Kurucz ATLAS9 atmospheres. We find that thick disk stars are chemically disjunct for Zn and Eu and also show on average higher Zr but lower Ba and Y when compared to the thin disk stars. We also discovered that the previously identified high-$\alpha$ metal-rich population is also enhanced in Cu, Zn, Nd and Eu with respect to the thin disk but presents Ba and Y abundances lower on average, following the trend of thick disk stars towards higher metallities and further supporting the different chemical composition of this population. The ratio of heavy-s to light-s elements of thin disk stars presents the expected behaviour (increasing towards lower metallicities) and can be explained by a major contribution of low-mass AGB stars for s-process production at disk metallicities. However, the opposite trend found for thick disk stars suggests that intermediate-mass AGB stars played an important role in the enrichment of the gas from where these stars formed. Previous works in the literature also point to a possible primary production of light-s elements at low metallicities to explain this trend. Finally, we also find an enhancement of light-s elements in the thin disk at super solar metallicities which could be caused by the contribution of metal-rich AGB stars. (short version)

Comment: 20 pages, 19 figures, accepted by A&A

Subjects by Vocabulary

Microsoft Academic Graph classification: Physics education.field_of_study Population Astrophysics Galaxy Stars Supernova Nucleosynthesis Galaxy formation and evolution Asymptotic giant branch Disc education

Keywords

FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Solar and Stellar Astrophysics (astro-ph.SR)

98 references, page 1 of 10

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Adibekyan, V. Z., Santos, N. C., Sousa, S. G., & Israelian, G. 2011, A&A, 535, L11

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    128
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 1%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
128
Top 1%
Top 10%
Top 1%
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FCT| IF/00169/2012/CP0150/CT0002
Project
IF/00169/2012/CP0150/CT0002
Extra-solar planets: the quest for other Earths
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: IF/00169/2012/CP0150/CT0002
  • Funding stream: Investigador FCT
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FCT| Overcoming today´s challenges in the quest for other Earths
Project
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: PTDC/FIS-AST/1526/2014
  • Funding stream: Projetos de Investigação Científica e Desenvolvimento Tecnológico - 2014 (P2020) ; 9471 - RIDTI
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FCT| Institute of Astrophysics and Space Sciences
Project
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: UID/FIS/04434/2013
  • Funding stream: 6817 - DCRRNI ID
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,
FCT| GES
Project
GES
The Gaia-ESO census of the Milky way: unlocking the secrets of stellar populations
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: PTDC/FIS-AST/7073/2014
  • Funding stream: Projetos de Investigação Científica e Desenvolvimento Tecnológico - 2014 (P2020) ; 9471 - RIDTI
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