English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Aims. We present a spectroscopic analysis of a sample of evolved stars in M67(turn-off, subgiant and giant stars) in order to bring observationalconstraints to evolutionary models taking into account non-standard transportprocesses. Methods. We determined the stellar parameters (Teff, log g, [Fe/H]),microturbulent and rotational velocities and, Lithium abundances (ALi) for 27evolved stars of M67 with the spectral synthesis method based on MARCS modelatmospheres. We also computed non-standard stellar evolution models, takinginto account atomic diffusion and rotation-induced transport of angularmomentum and chemicals that were compared with this set of homogeneous data.Results. The lithium abundances that we derive for the 27 stars in our samplefollow a clear evolutionary pattern ranging from the turn-off to the Red GiantBranch. Our abundance determination confirms the well known decrease of lithiumcontent for evolved stars. For the first time, we provide a consistentinterpretation of both the surface rotation velocity and of the lithiumabundance patterns observed in an homogeneous sample of TO and evolved stars ofM67. We show that the lithium evolution is determined by the evolution of theangular momentum through rotation-induced mixing in low-mass stars, inparticular for those with initial masses larger than 1.30 M_\odot at solarmetallicity.

Lithium abundances and extra mixing processes in evolved stars of M67