Chromospherically active stars: Lithium and CNO abundances in northern RS CVn stars

B. Bale, G. Tautvaišienė, R. Minkevičiūtė, A. Drazdauskas, Š. Mikolaitis, E. Stonkutė, M. Ambrosch

A&A,703, A128 (2025)
https://www.aanda.org/articles/aa/full_html/2025/11/aa56683-25/aa56683-25.html

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 of stellar atmospheres.

Chromospherically active stars: Chemical composition of photospheres in 20 RS CVn stars

B. Bale, G. Tautvaišienė, R. Minkevičiūtė, A. Drazdauskas, Š. Mikolaitis, E. Stonkutė, M. Ambrosch

A&A,696, A23 (2025)
https://www.aanda.org/articles/aa/abs/2025/04/aa52780-24/aa52780-24.html

Aims. To investigate how magnetic activity influences mixing in the atmospheres of magnetically active stars, we carried out a detailed study of C, N, and up to ten other chemical element abundances, as well as carbon isotope ratios in a sample of RS CVn stars.

[Y/Mg] as a Stellar Chronometer: Combining Asteroseismic and Chemical Data

V. Viscasillas Vazquez, G. Tautvaišienė, E. Pakštienė, A. Drazdauskas, Y. Chorniy, V. Bagdonas, Š. Mikolaitis, R. Minkevičiūtė, E. Stonkutė

Galaxies, 13(6), 136 (2025)
https://www.mdpi.com/2075-4434/13/6/136

For a sample of 205 stars observed with the high-resolution spectrograph and 1.65 m telescope at the Molėtai Astronomical Observatory in Lithuania, we determined Y and Mg abundances and derived new asteroseismic ages from TESS observations.

Carbon and nitrogen as indicators of stellar evolution and age. A homogeneous sample of 44 open clusters from the Gaia-ESO Survey

G. Tautvaišienė, A. Drazdauskas, Š. Mikolaitis, R. Minkevičiūtė, E. Stonkutė, S. Randich, A. Bragaglia, L. Magrini, R. Smiljanic, M. Ambrosch, V. Bagdonas, G. Casali, Y. Chorniy, C. Viscasillas Vázquez

A&A,703, A4 (2025)
https://www.aanda.org/articles/aa/full_html/2025/11/aa55685-25/aa55685-25.html

Aims. Based on high-resolution spectral observations of 44 open star clusters in the Gaia-ESO survey, our aim is to perform the first large-scale homogeneous investigation into the carbon and nitrogen photospheric content of low- and intermediate-mass giant stars in different phases of evolution.

Chemical composition of planetary hosts. II. Abundances of neutron-capture elements

A. Sharma, E. Stonkutė, A. Drazdauskas, R. Minkevičiūtė, Š. Mikolaitis, G. Tautvaišienė, U. Jonauskaitė

A&A,701, A153 (2025)
https://www.aanda.org/articles/aa/full_html/2025/09/aa55466-25/aa55466-25.html

Aims. This study seeks to determine abundances of neutron-capture elements (Sr, Y, Zr, Ba, La, Ce, Nd, Pr, and Eu) in a large and homogeneous sample of F, G, and K-type planet-host stars (PHSs) located in the northern hemisphere.

Modelling chemical clocks. Theoretical evidences of the space and time evolution of [s/α] in the Galactic disc with Gaia-ESO survey

M. Morelo, L. Magrini, M. Palla, G. Cescutti, C. Viscasillas Vázquez, G. Casali, E. Spitoni, F. Matteucci, S. Randich

A&A,694, A274 (2025)
https://www.aanda.org/articles/aa/full_html/2025/02/aa53466-24/aa53466-24.html

Aims. Our aim is to provide chemical evolution models for different regions of the Milky Way (MW) disc in order to identify the conditions required to reproduce the observed [s/H], [s/Fe], and [s/α] versus age relations.

Gaia DR3 reveals the complex dynamical evolution within star clusters

C. Viscasillas Vázquez, L. Magrini, N. Miret-Roig, N. J. Wright, J. Alves, L. Spina, R. P. Church, G. Tautvaišienė, S. Randich

A&A, 689, A268 (2024)
https://www.aanda.org/articles/aa/full_html/2024/09/aa50573-24/aa50573-24.html

Aims. This study aims to investigate correlations between the Mean Interdistance, Mean Closest Interdistance, and Median Weighted Central Interdistance with the age of star clusters, examining their evolutionary trends and assessing the robustness of these quantities as possible age indicators.

Chemical composition of planetary hosts

A. Sharma, E. Stonkutė, A. Drazdauskas, R. Minkevičiūtė, Š. Mikolaitis, G. Tautvaišienė, T. Narbuntas

A&A, 691, A160 (2024)
https://www.aanda.org/articles/aa/full_html/2024/11/aa51889-24/aa51889-24.html

 
Aims. Our objective is to uniformly determine atmospheric parameters and chemical abundances of carbon (C), nitrogen (N), oxygen(O), and the α-elements, magnesium (Mg) and silicon (Si), along with C/O, N/O and Mg/Si abundance ratios for planet-hosting stars. In this analysis, we aim to investigate the potential links between stellar chemistry and the presence of planets.
 
 
The Gaia-ESO Survey DR5.1 and Gaia DR3 GSP-Spec: a comparative analysis
 
M. Van der Swaelmen, C. Viscasillas Vázquez, L. Magrini, A. Recio-Blanco, P. A. Palicio, C. Worley, A. Vallenari, L. Spina, P. François, G. Tautvaišienė, G. G. Sacco, S. Randich, P. de Laverny.
 
 
Article aims. To take advantage of the intersections between Gaia RVS and Gaia-ESO to compare their stellar parameters, abundances and radial and rotational velocities.
 

OCCASO V. Chemical-abundance trends with Galactocentric distance and age
 
J. Carbajo-Hijarrubia, L. Casamiquela, R. Carrera, L. Balaguer-Núñez, C. Jordi, F. Anders, C. Gallart, E. Pancino, A. Drazdauskas, E. Stonkutė, G. Tautvaišienė, J. M. Carrasco, E. Masana, T. Cantat-Gaudin and S. Blanco-Cuaresma
 
A&A, 687, A239 (2024)
 
Article aim is to study the chemical distribution of the Galactic disk using open clusters by analyzing the existence of gradients with Galactocentric distance, azimuth, or height from the plane and dependency with age.
 

12C/13C of Kepler giant stars: The missing piece of the mixing puzzle
 
N. Lagarde, R. Minkevičiūtė, A. Drazdauskas, G. Tautvaišienė, C. Charbonnel, C. Reylé, A. Miglio, T. Kushwahaa and B. Bale
 
 
Articles aims: We present the CNO and 12C/13C abundances derived for 71 giant field stars. Then, using this new catalogue and complementary data from the Kepler and Gaia satellites, we study the efficiency of mixing occurring in the giant branch as a function of the stellar properties of the stars (e.g. mass, age, metallicity).
 
 
The role of radial migration in open cluster and field star populations with Gaia DR3
 
C. Viscasillas Vázquez, L. Magrini, L. Spina, G. Tautvaišienė, M. Van der Swaelmen, S. Randich and G. G. Sacco
 
 
Aims. This study aims to investigate whether open clusters and field stars respond differently to the perturbations that cause radial migration. In particular, we aim to understand the nature of the oldest surviving clusters.