Solar twins: lithium abundance scatter

T Mishenina , C Soubiran (1) , C Charbonnel (2) , M Katsova , B Nizamov

1 M2A 2019
2 IRAP - Institut de recherche en astrophysique et planétologie

To clarify the reasons for the dispersion of Li in the atmosphere of solar type stars, a set of 56 solar analogs including 22 solar twins is analysed based on spectra obtained with the ELODIE spectrograph at Observatoire de Haute Provence (France). Lithium abundances are derived by comparing observed and synthetic spectra in the region of Li I line 6707 Å in LTE approximation. The dependencies of the Li abundances on effective temperature Teff, age, rotational velocities vsini and chromospheric activity log R'HK were constructed and analyzed in the frame of stellar evolution theories. The results obtained are generally consistent with theories considering induced-rotational mixing.

Mots clés: Stars; abundances -Stars; evolution -Stars; solar-type

Domaines: Astrophysique [astro-ph]

T Mishenina, C Soubiran, C Charbonnel, M Katsova, B Nizamov. Solar twins: lithium abundance scatter. Memorie della Societa Astronomica Italiana, Nov 2019, Monte Porzio Catone, Italy. ⟨hal-03052889⟩