3 papers
astro-ph.SR2025
Spectroscopic study of the late B-type eclipsing binary system AR Aurigae A and B: Towards clarifying the differences in atmospheric parameters and chemical abundances
Yoichi Takeda
AR Aur A+B is a close binary of astrophysical interest, because dissimilar surface compositions are reported between similar late B-type dwarfs. A new spectroscopic study on this s…
astro-ph.SR2024
Measurement of Solar Differential Rotation by Absolutely Calibrated Iodine-Cell Spectroscopy
Yoichi Takeda
The iodine-cell technique, which is known to be efficient in precisely establishing Doppler velocity shifts, was once applied by the author to measuring the solar differential rota…
astro-ph.SR2024
On the chemical abundance differences between the solar twin visual binary system 16 Cygni A and B
Yoichi Takeda
The visual binary system 16~Cyg~A+B consists of similar solar twins, but a planetary companion is detected only in B. An intensive spectroscopic differential analysis is carried ou…