535 citations · 1.3k across the 25 of their papers we have counts for
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Photospheric carbon, nitrogen, and oxygen abundances of A-type main-sequence stars
Yoichi Takeda, Satoshi Kawanomoto, Naoko Ohishi +4
Based on the spectrum fitting method applied to CI 5380, NI 7486, and OI 6156-8 lines, we determined the abundances of C, N, and O for 100 mostly A-type main-sequence stars (late B…
Fourier analysis of He 4471/Mg 4481 line profiles for separating rotational velocity and axial inclination in rapidly-rotating B-type stars
Y. Takeda, S. Kawanomoto, N. Ohishi
While the effect of rotation on spectral lines is complicated in rapidly-rotating stars because of the appreciable gravity-darkening effect differing from line to line, it is possi…
On the Sodium versus Iron Correlation in Late B-Type Stars
Yoichi Takeda, Satoshi Kawanomoto, Naoko Ohishi
With an aim to study whether the close correlation between [Na/H] and [Fe/H] recently found in A-type stars further persists in the regime of B-type stars, the abundances of Na wer…
Lithium, Sodium, and Potassium Abundances in Sharp-Lined A-Type Stars
Yoichi Takeda, Dong-Il Kang, Inwoo Han +4
The abundances of alkali elements (Li, Na, and K) were determined from the Li I 6708, Na I 5682/5688, and K I 7699 lines by taking into account the non-LTE effect for 24 sharp-line…