3 papers
astro-ph.SR2026
The non-LTE abundances of magnesium and yttrium and asteroseismic ages for the chemical clock calibration
Å . Mikolaitis, G. TautvaiÅ¡ienÄ, E. PakÅ¡tienÄ +11
The authors determine magnesium and yttrium abundances using non‑LTE spectral synthesis and combine these with asteroseismic and isochrone ages to study how the [Y/Mg]‑age relation…
astro-ph.SR2025
Chromospherically active stars: Lithium and CNO abundances in northern RS CVn stars
B. Bale, G. Tautvaisiene, R. Minkeviciute +4
Aims: We carried out a detailed investigation of Lithium and CNO abundances, including carbon isotope ratios, in RS CVn stars to assess the role of magnetic activity in the mixing…
astro-ph.SR2025
Chromospherically active stars: Chemical composition of photospheres in 20 RS CVn stars
B. Bale, G. Tautvaisiene, R. Minkeviciute +4
Context. Various element transport processes modify the photospheric chemical composition of low-mass stars during their evolution. The most prominent one is the first dredge-up th…