Title The Gaia -ESO Survey: Probing the lithium abundances in old metal-rich dwarf stars in the solar vicinity /
Authors Dantas, M. L.L ; Guiglion, G ; Smiljanic, R ; Romano, D ; Magrini, L ; Bensby, T ; Chiappini, C ; Franciosini, E ; Nepal, S ; Tautvaišienė, Gražina ; Gilmore, G ; Randich, S ; Lanzafame, A. C ; Heiter, U ; Morbidelli, L ; Prisinzano, L ; Zaggia, S
DOI 10.1051/0004-6361/202245230
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Is Part of Astronomy and astrophysics.. Paris : EDP Sciences. 2022, vol. 668, art. no. L7, p. [1-7].. ISSN 0004-6361. eISSN 1432-0746
Keywords [eng] Galaxy: abundances ; Galaxy: evolution ; Galaxy: stellar content ; ISM: abundances ; Stars: abundances
Abstract [eng] Context. Lithium (Li) is a fragile element that is produced in a variety of sites but can also be very easily depleted in stellar photospheres. Radial migration has been reported to explain the decrease in the upper envelope of Li measurements observed for relatively old metal-rich dwarf stars in some surveys. Aims. We test a scenario in which radial migration could affect the Li abundance pattern of dwarf stars in the solar neighbourhood. This may confirm that the Li abundances in these stars cannot serve as a probe for the Li abundance in the interstellar medium (ISM). In other words, to probe the evolution of the Li abundance in the local ISM, it is crucial that stellar intruders be identified and removed from the adopted sample. Methods. We used the high-quality data (including Li abundances) from the sixth internal Data Release of the Gaia-ESO survey. In this sample we grouped stars by similarity in chemical abundances via hierarchical clustering. Our analysis treats both measured Li abundances and upper limits. Results. The Li envelope of the previously identified radially migrated stars is well below the benchmark meteoritic value (0 should not be decreased, as recently proposed in the literature. Our study backs recent studies that claim that old dwarfs on the hot side of the dip are efficient probes of the ISM abundance of Li, provided atomic diffusion does not significantly lower the initial Li abundance in the atmospheres of metal-rich objects.
Published Paris : EDP Sciences
Type Journal article
Language English
Publication date 2022
CC license CC license description