2020A&A...640L...1R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:17:24

2020A&A...640L...1R - Astronomy and Astrophysics, volume 640, L1-1 (2020/8-1)

The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity.

RANDICH S., PASQUINI L., FRANCIOSINI E., MAGRINI L., JACKSON R.J., JEFFRIES R.D., D'ORAZI V., ROMANO D., SANNA N., TAUTVAISIENE G., TSANTAKI M., WRIGHT N.J., GILMORE G., BENSBY T., BRAGAGLIA A., PANCINO E., SMILJANIC R., BAYO A., CARRARO G., GONNEAU A., HOURIHANE A., MORBIDELLI L. and WORLEY C.C.

Abstract (from CDS):


Context. Reconstructing the Galactic evolution of lithium (Li) is the main tool used to constrain the source(s) of Li enrichment in the Galaxy. Recent results have suggested a decline in Li at supersolar metallicities, which may indicate reduced production.
Aims. We exploit the unique characteristics of the Gaia-ESO Survey open star cluster sample to further investigate this issue and to better constrain the evolution of Li at high metallicity.
Methods. We trace the upper envelope of Li abundance versus metallicity evolution using 18 clusters and considering members that should not have suffered any Li depletion.
Results. At variance with previous claims, we do not find any evidence of a Li decrease at high metallicity. The most metal-rich clusters in the sample ([Fe/H]≃0.3) actually show the highest Li abundances, with A(Li)>3.4. Our results clearly show that previous findings, which were based on field stars, were affected by selection effects. The metal-rich population in the solar neighbourhood is composed of relatively old and cool stars that have already undergone some Li depletion; hence, their measured Li does not represent the initial interstellar medium abundance, but a lower limit to it.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: evolution - open clusters and associations: general

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2243 OpC 06 29 34 -31 17.0   10.12 9.4     ~ 216 0
2 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1602 1
3 NGC 2420 OpC 07 38 23 +21 34.4   9.0 8.3     ~ 405 0
4 NGC 2516 OpC 07 58 04 -60 45.2           ~ 595 0
5 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 317 0
6 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
7 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 434 0
8 NAME Cha I MoC 11 06 48 -77 18.0           ~ 986 1
9 Cl Trumpler 20 OpC 12 39 45 -60 38.1     10.1     ~ 76 0
10 NGC 6067 OpC 16 13 11 -54 13.1           ~ 173 0
11 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3066 0
12 NGC 6259 OpC 17 00 45 -44 39.3   8.85 8.0     ~ 57 0
13 IC 4665 OpC 17 46 18 +05 43.0           ~ 317 0
14 C 1749-295 OpC 17 52 43 -29 33.0           ~ 19 0
15 NGC 6530 OpC 18 04 31 -24 21.5   4.74 4.6     ~ 354 1
16 NGC 6705 OpC 18 51 05 -06 16.2   6.32 5.8     ~ 359 0
17 Cl Berkeley 81 OpC 19 01 37 -00 27.6           ~ 51 0
18 NGC 6802 OpC 19 30 36.0 +20 15 34   10.07 8.8     ~ 79 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:17:24

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