SIMBAD references

2016A&A...592A..87A - Astronomy and Astrophysics, volume 592A, 87-87 (2016/8-1)

Abundance trend with condensation temperature for stars with different Galactic birth places.

ADIBEKYAN V., DELGADO-MENA E., FIGUEIRA P., SOUSA S.G., SANTOS N.C., GONZALEZ HERNANDEZ J.I., MINCHEV I., FARIA J.P., ISRAELIAN G., HARUTYUNYAN G., SUAREZ-ANDRES L. and HAKOBYAN A.A.

Abstract (from CDS):

Context. During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astrophysical nature of this correlation is still debated.
Aims. The main goal of this work is to explore the possible dependence of the Tc trend on stellar Galactocentric distances, Rmean.
Methods. We used high-quality spectra of about 40 stars observed with the HARPS and UVES spectrographs to derive precise stellar parameters, chemical abundances, and stellar ages. A differential line-by-line analysis was applied to achieve the highest possible precision in the chemical abundances.
Results. We confirm previous results that [X/Fe] abundance ratios depend on stellar age and that for a given age, some elements also show a dependence on Rmean. When using the whole sample of stars, we observe a weak hint that the Tc trend depends on Rmean. The observed dependence is very complex and disappears when only stars with similar ages are considered.
Conclusions. To conclude on the possible dependence of the Tc trend on the formation place of stars, a larger sample of stars with very similar atmospheric parameters and stellar ages observed at different Galactocentric distances is needed.

Abstract Copyright: © ESO, 2016

Journal keyword(s): techniques: spectroscopic - stars: abundances - stars: atmospheres - Galaxy: disk - Galaxy: evolution

VizieR on-line data: <Available at CDS (J/A+A/592/A87): param.dat abund.dat>

Simbad objects: 46

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2019.12.14-06:02:54

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