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Determination of Potassium Abundances for Giant and Dwarf Stars in the Galactic Disk
Takeda, Yoichi
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 7698.96Å to a large sample of 160 FGK dwarfs and 328 late-G/early-K giants (including 89 giants in the Kepler field with seismologically known ages) belonging to the disk population (‑1≤[F…
Radial Velocity Variations of ADS 3085 A and B
Sato, Bun'ei; Itoh, Yoichi; Katoh, Noriyuki
Some observations have indicated that the binary frequency of pre-main-sequence stars is higher than that of main-sequence stars. Several hot jupiters which are gas planets with the orbital period of days are discovered in the main-sequence stars (e.g., Mayor & Queloz 1995). Most of the main-sequence stars may be formed as the binary system. T…