J/A+A/595/A18 Lithium abundances in AMBRE stars (Guiglion+, 2016)
The AMBRE Project: Constraining the lithium evolution in the Milky Way.
Guiglion G., de Laverny P., Recio-Blanco A., Worley C. C., De Pascale M.,
Masseron T., Prantzos N., Mikolaitis S.
<Astron. Astrophys. 595, A18 (2016)>
=2016A&A...595A..18G 2016A&A...595A..18G (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way; Stars, F-type ; Stars, G-type ; Stars, K-type ;
Abundances ; Spectroscopy
Keywords: galaxy: abundance - galaxy: stellar content - Galaxy: formation -
stars: abundance
Abstract:
The goal of this paper is to investigate the lithium stellar content
of Milky Way stars in order to put constraints on the lithium chemical
enrichment in our Galaxy, in particular in both the thin and thick
discs.
We show that the interstellar lithium abundance increases with
metallicity by 1dex from [M/H]=-1dex to +0.0dex. Moreover, we find
that this lithium ISM abundance decreases by about 0.5dex at
super-solar metallicity.
Based on a chemical separation, we also observed that the stellar
lithium content in the thick disc increases rather slightly with
metallicity while the thin disc shows a steeper increase. The lithium
abundance distribution of alpha-rich metal-rich stars has a peak at
A(Li)∼3 dex.
We conclude that the thick disc stars suffered of a low lithium
chemical enrichment, showing lithium abundances rather close to the
Spite plateau while the thin disc stars clearly show an increasing
lithium chemical enrichment with the metallicity, probably thanks to
the contribution of low-mass stars.
Description:
Thanks to high resolution spectra from the ESO FEROS, UVES and HARPS
archive and high quality atmospheric parameters, we have been able to
build a massive and homogeneous catalogue of lithium abundances for
7272 stars derived with an automatic method coupling a synthetic
spectra grid and a Gauss-Newton algorithm. These lithium abundances
have been validated with literature values, including those of the
Gaia benchmark stars. We provide the star identifier, the spectrograph
name, the LTE lithium abundance and its error, and the NLTE
correction.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lithium.dat 47 7272 Star identifier, spectrograph, LTE lithium
abundance, error and NLTE correction
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See also:
J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)
J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)
J/A+A/582/A81 : Gaia FGK benchmark stars: abundances (Jofre+, 2015)
J/A+A/592/A70 : Gaia FGK stars: low-metallicities candidates (Hawkins+, 2016)
Byte-by-byte Description of file: lithium.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Star identifier
27 A1 --- Spectro [HUF] Spectrograph (1)
29 A1 --- l_ALi Limit flag on ALi
30- 34 F5.2 --- ALi LTE lithium abundance
36- 39 F4.2 --- e_ALi ? rms uncertainty on ALi
42- 47 F6.3 --- NLTE ? NTLE correction
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Note (1): Spectrograph code as follows:
H = HARPS
U = UVES
F = FEROS
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Acknowledgements:
Guillaume Guiglion, guillaume.guiglion(at)oca.eu
(End) Guillaume Guiglion [OCA, France], Patricia Vannier [CDS] 09-Aug-2016