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astro-ph.SR2025
Barium abundances of A--F--G type stars in the Hyades cluster
Yoichi Takeda
With an aim of clarifying the extent and parameter-dependence of compositional anomaly of barium in A-type stars, Ba abundances were spectroscopically determined based on BaII 6141…
astro-ph.SR2025
Atmospheric parameters and chemical abundances of the A-type eclipsing binary system RR Lyncis A and B
Yoichi Takeda
A spectroscopic study was carried out for the double-line A-type eclipsing binary system RR Lyn A+B based on the disentangled spectra, with an aim of clarifying the differences in…
astro-ph.SR2025
Formation of Al II lines and photospheric aluminium abundances in B-type stars
Yoichi Takeda
Aluminium abundances of B-type stars were spectroscopically determined in order to get information about the galactic gas composition at the time of their formation. For this purpo…