237 citations · 2.9k across the 92 of their papers we have counts for
16 papers · 1 filter
Rotation and surface abundance peculiarities in A-type stars
Yoichi Takeda, Inwoo Han, Dong-Il Kang +2
In an attempt of clarifying the connection between the photospheric abundance anomalies and the stellar rotation as well as of exploring the nature of "normal A" stars, the abundan…
Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD 167042
Bun'ei Sato, Eri Toyota, Masashi Omiya +9
We report on the detection of four extrasolar planets orbiting evolved intermediate-mass stars from a precise Doppler survey of G and K giants at Okayama Astrophysical Observatory.…
Stellar Parameters and Elemental Abundances of Late-G Giants
Yoichi Takeda, Bun'ei Sato, Daisuke Murata
The properties of 322 intermediate-mass late-G giants (comprising 10 planet-host stars) selected as the targets of Okayama Planet Search Program, many of which are red-clump giants…
Abundances of lithium, sodium, and potassium in Vega
Y. Takeda
Vega's photospheric abundances of Li, Na, and K were determined by using considerably weak lines measured on the very high-S/N spectrum, while the non-LTE correction and the gravit…
Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Del, xi Aql, and HD 81688
Bun'ei Sato, Hideyuki Izumiura, Eri Toyota +11
We report the detection of 3 new extrasolar planets from the precise Doppler survey of G and K giants at Okayama Astrophysical Observatory. The host stars, namely, 18 Del (G6 III),…
A Substellar Companion to the Intermediate-Mass Giant 11 Com
Y. J. Liu, Bun'ei Sato, G. Zhao +16
We report the detection of a substellar companion orbiting the intermediate-mass giant star 11 Com (G8 III). Precise Doppler measurements of the star from Xinglong station and Okay…