237 citations · 2.9k across the 92 of their papers we have counts for
93 papers
Does the A-type Metallic-line Star IW Persei Have Non-Uniform Chemical Anomaly on the Surface?
Yoichi Takeda
IW Per, a single-lined spectroscopic binary with a short period of 0.92d, is known to be a A-type metallic-line (Am) star showing anomalous line strengths of specific elements. Pre…
Spectroscopic comparative study of the red giant binary system gamma Leonis A and B
Yoichi Takeda
Gamma~Leo is a long-period visual binary system consisting of K0III (A) and G7III (B) giants, in which particular interest is attracted by the brighter A since the discovery of a p…
Surface magnetic field of the A-type metallic-line star omicron Pegasi revisited
Yoichi Takeda
The bright A-type metallic-line star o Peg was reported in the early 1990s to have a surface magnetic field of ~2kG by analyzing the widths and strengths of spectral lines. In resp…
Spectroscopic determination of C, N, and O abundances of solar-analog stars based on the lines of hydride molecules
Yoichi Takeda
Photospheric C, N, and O abundances of 118 solar-analog stars were determined by applying the synthetic-fitting analysis to their spectra in the blue or near-UV region comprising l…
Surface C, N, O, and Na abundances of RR Lyrae variables implying the nature of internal mixing in low-mass stars
Yoichi Takeda
Photospheric abundances of C, N, O, and Na were determined by applying the synthetic spectrum-fitting technique to 34 snap-shot high-dispersion spectra of 22 RR Lyr stars covering…
Mass evaluation for red giant stars based on the spectroscopically determined atmospheric parameters
Yoichi Takeda
The mass (M) of a star can be evaluated from its spectroscopically determined effective temperature (T _eff) and metallicity ([Fe/H]) along with the luminosity (L; derived from par…