237 citations · 2.9k across the 92 of their papers we have counts for
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Photospheric carbon and oxygen abundances of F-G type stars in the Pleiades cluster
Yoichi Takeda, Osamu Hashimoto, Satoshi Honda
In order to investigate the carbon-to-oxygen ratio of the young open cluster M45 (Pleiades), the C and O abundances of selected 32 F-G type dwarfs (in the effective temperature ran…
Sulfur and zinc abundances of red giant stars
Yoichi Takeda, Masashi Omiya, Hiroki Harakawa +1
Sulfur and zinc are chemically volatile elements, which play significant roles as depletion-free tracers in studying galactic chemical evolution. However, regarding red giants havi…
The K2-ESPRINT Project V: a short-period giant planet orbiting a subgiant star
Vincent Van Eylen, Simon Albrecht, Davide Gandolfi +31
We report on the discovery and characterization of the transiting planet K2-39b (EPIC 206247743b). With an orbital period of 4.6 days, it is the shortest-period planet orbiting a s…
High-Contrast Imaging of Intermediate-Mass Giants with Long-Term Radial Velocity Trends
Tsuguru Ryu, Bun'ei Sato, Masayuki Kuzuhara +62
A radial velocity (RV) survey for intermediate-mass giants has been operated for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some gia…
A non-LTE study of silicon abundances in giant stars from the Si I infrared lines in the zJ-band
Kefeng Tan, Jianrong Shi, Masahide Takada-Hidai +2
We investigate the feasibility of the Si I infrared (IR) lines as Si abundance indicators for giant stars. We find that Si abundances obtained from the Si I IR lines based on the l…
Oxygen abundance determination of B-type stars with the OI 7771-5A lines
Yoichi Takeda, Satoshi Honda
Oxygen abundances of 34 B-type stars in the effective temperature range of Teff~10000-28000K with diversified rotational velocities (vesini~ 0-250km/s) were determined from the OI…