237 citations · 2.9k across the 92 of their papers we have counts for
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Behaviors of Ca II K line in A-type stars
Yoichi Takeda
A synthetic spectrum-fitting analysis was applied to the Ca II line at 3933.68 A for 122 A-type stars (7000 <Te < 10000 K) in a wide range of rotational velocity (10 < vsini < 300…
On the rotational velocity of Sirius A
Yoichi Takeda
With an aim of getting information on the equatorial rotation velocity (v_e) of Sirius A separated from the inclination effect (sin i), a detailed profile analysis based on the Fou…
Spectroscopic Determination of Stellar Parameters and Oxygen Abundances for Hyades/Field G-K Dwarfs
Yoichi Takeda, Satoshi Honda
It has been occasionally suggested that Fe abundances of K dwarfs derived from Fe I and Fe II lines show considerable discrepancies and oxygen abundances determined from high-excit…
Spectrum variability of the active solar-type star Xi Bootis A
Yoichi Takeda, Satoshi Honda, Hikaru Taguchi +1
An extensive spectroscopic study on ξBoo A (chromospherically active solar-type star) was conducted based on the spectra obtained in 2008 December though 2010 May, with an aim to d…
Determination of Potassium Abundances for Giant and Dwarf Stars in the Galactic Disk
Yoichi Takeda
An extensive study on the potassium abundances of late-type stars was carried out by applying the non-LTE spectrum-fitting analysis to the K I resonance line at 7698.96A to a large…