237 citations · 2.9k across the 92 of their papers we have counts for
5 papers · 1 filter
Regular Radial Velocity Variations in Nine G- and K-type Giant Stars: Eight Planets and One Planet Candidate
Huan-Yu Teng, Bun'ei Sato, Takuya Takarada +9
We report the detection of radial velocity variations in nine evolved G- and K-type giant stars. The observations were conducted at Okayama Astrophysical Observatory. Planets or pl…
Center--limb variation of solar photospheric microturbulence
Yoichi Takeda
Microturbulence (ξ) is a key parameter introduced in stellar spectroscopy to explain the strength of saturated lines by formally incorporating an additional thermal broadening term…
Determination of Vega's rotational velocity based on the Fourier analysis of spectral line profiles
Yoichi Takeda
While it is known that the sharp-line star Vega (vsini ~ 20km/s) is actually a rapid rotator seen nearly pole-on with low i (< 10 deg), no consensus has yet been accomplished regar…
A compositional link between rocky exoplanets and their host stars
Vardan Adibekyan, Caroline Dorn, Sérgio G. Sousa +17
Stars and planets both form by accreting material from a surrounding disk. Because they grow from the same material, theory predicts that there should be a relationship between the…
Rubidium abundances of galactic disk stars
Yoichi Takeda
Spectroscopic determinations of Rubidium abundances were conducted by applying the spectrum fitting method to the Rb I 7800 line for an extensive sample of ~500 late-type dwarfs as…