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J/A+A/610/A38       Li enrichment histories of the thick/thin disc  (Fu+, 2018)

The Gaia-ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc. Fu X., Romano D., Bragaglia A., Mucciarelli A., Lind K., Delgado Mena E., Sousa S.G., Randich S., Bressan A., Sbordone L., Martell S., Korn A.J., Abia C., Smiljanic R., Jofre P., Pancino E., Tautvaisiene G., Tang B., Lanzafame A.C., Magrini L., Carraro G., Bensby T., Damiani F., Alfaro E.J., Flaccomio E., Morbidelli L., Zaggia S., Lardo C., Monaco L., Frasca A., Donati P., Drazdauskas A., Chorniy Y., Bayo A., Kordopatis G. <Astron. Astrophys. 610, A38 (2018)> =2018A&A...610A..38F (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, dwarfs ; Abundances Keywords: stars: abundances - Galaxy: abundances - Galaxy: disc Abstract: Lithium abundance in most of the warm metal-poor main sequence stars shows a constant plateau (A(Li)∼2.2dex) and then the upper envelope of the lithium vs. metallicity distribution increases as we approach solar metallicity. Meteorites, which carry information about the chemical composition of the interstellar medium at the solar system formation time, show a lithium abundance A(Li)∼3.26dex. This pattern reflects the Li enrichment history of the interstellar medium during the Galaxy lifetime. After the initial Li production in Big Bang Nucleosynthesis, the sources of the enrichment include AGB stars, low-mass red giants, novae, type II supernovae, and Galactic cosmic rays. The total amount of enriched Li is sensitive to the relative contribution of these sources. Thus different Li enrichment histories are expected in the Galactic thick and thin disc. We investigate the main sequence stars observed with UVES in Gaia-ESO Survey iDR4 catalog and find a Li-[alpha/Fe] anticorrelation independent of [Fe/H], Teff, and log(g). Since in stellar evolution different α enhancements at the same metallicity do not lead to a measurable Li abundance change, the anticorrelation indicates that more Li is produced during the Galactic thin disc phase than during the Galactic thick disc phase. We also find a correlation between the abundance of Li and s-process elements Ba and Y, and they both decrease above the solar metallicity, which can be explained in the framework of the adopted Galactic chemical evolution models. Description: To investigate the Galactic lithium enrichment history we se- lect well-measured main sequence field stars with UVES spectra from the GES iDR4 catalogue. In our selection, 1884 UVES stars are marked as field stars, including those of the Galactic disc and halo designated as MW (GE_MW) fields, standard CoRoT (GE_S D_CR) field, standard radial velocity (GE_S D_RV) field, and stars to the Galactic Bulge direction (GEMWBL). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 130 1399 Stellar parameters, the selected chemical abundances, and their corresponding uncertainties of stars in our final sample
See also: J/A+A/574/L7 : Gaia-ESO Survey: Li-rich stars in NGC2547 (Sacco+, 2015) J/A+A/598/A5 : Gaia-ESO Survey iDR4 calibrators (Pancino+, 2017) J/A+A/601/A112 : GES iDR4 Mg-Al anticorrelation in GCs (Pancino+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- CName Name derived from the object's equatorial coordinate (HHMMSSss+DDMMSSs) 18- 43 A26 --- Star Object name 45- 48 F4.2 [Sun] ALiLTE LTE Li abundance from GES iDR4 50- 53 F4.2 [Sun] e_ALiLTE ? Uncertainty of LTE Li abundance 55- 58 F4.2 [Sun] ALiNLTE NLTE Li abundance 60- 67 A8 --- CatLi Li abundance category (1) 69- 73 F5.2 [Sun] [alpha/Fe] Mean value of [alpha/Fe] from MCMC 75- 78 F4.2 [Sun] e_[alpha/Fe] 1sigma uncertainty of [alpha/Fe] from MCMC 80- 84 F5.2 [Sun] [Fe/H] Iron abundance from GES iDR4 catalogue 86- 89 F4.2 [Sun] e_[Fe/H] Uncertainty of [Fe/H] 91- 94 F4.2 [Sun] logg Surface gravity from GES iDR4 96- 99 F4.2 [Sun] e_logg Uncertainty of log(g) 101-104 I4 K Teff Effective temperature from GES iDR4 106-108 I3 K e_Teff Uncertainty of Teff 110-114 F5.2 [Sun] [Ba/Fe] Mean value of [Ba/Fe] from MCMC 116-119 F4.2 [Sun] e_[Ba/Fe] 1sigma uncertainty of [Ba/Fe] from MCMC 121-125 F5.2 [Sun] [Y/Fe] Mean value of [Y/Fe] from MCMC 127-130 F4.2 [Sun] e_[Y/Fe] 1sigma uncertainty of [Y/Fe] from MCMC
Note (1): Li abundance category flag as follows: meas. = checked Li measurement La.upper = labeled upper limits
Acknowledgements: Xiaoting Fu, xiaoting.fu(at)
(End) Xiaoting Fu [Unibo & INAF-OABO, Italy], Patricia Vannier [CDS] 16-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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