2021A&A...656A..64R


Query : 2021A&A...656A..64R

2021A&A...656A..64R - Astronomy and Astrophysics, volume 656A, 64-64 (2021/12-1)

The bi-modal 7Li distribution of the Milky Way's thin-disk dwarf stars. The role of Galactic-scale events and stellar evolution.

ROCA-FABREGA S., LLORENTE DE ANDRES F., CHAVERO C., CIFUENTES C. and DE LA REZA R.

Abstract (from CDS):


Context. The lithium abundance, A(Li), in stellar atmospheres suffers from various enhancement and depletion processes during the star's lifetime. While several studies have demonstrated that these processes are linked to the physics of stellar formation and evolution, the role that Galactic-scale events play in the galactic A(Li) evolution is not yet well understood.
Aims. We aim to demonstrate that the observed A(Li) bi-modal distribution, in particular in the FGK-dwarf population, is not a statistical artefact and that the two populations connect through a region with a low number of stars. We also want to investigate the role that Galactic-scale events play in shaping the A(Li) distribution of stars in the thin disk.
Methods. We use statistical techniques along with a Galactic chemical evolution model for A(Li) that includes most of the well-known 7Li production and depletion channels.
Results. We confirm that the FGK main-sequence stars belonging to the Milky Way's thin disk present a bi-modal A(Li) distribution. We demonstrate that this bi-modality can be generated by a particular Milky Way star formation history profile combined with the stellar evolution's 7Li depletion mechanisms. We show that A(Li) evolution can be used as an additional proxy for the star formation history of our Galaxy.

Abstract Copyright: © ESO 2021

Journal keyword(s): astrochemistry - stars: abundances - Galaxy: evolution - Galaxy: formation - Galaxy: abundances - solar neighborhood

Simbad objects: 3

goto Full paper

goto View the references in ADS

Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 800 0
2 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2031 2
3 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 352 0

To bookmark this query, right click on this link: simbad:objects in 2021A&A...656A..64R and select 'bookmark this link' or equivalent in the popup menu


2023.01.31-01:43:45

© Université de Strasbourg/CNRS

    • Contact