3 papers
astro-ph.SR2026
On the photospheric abundances of the B-type fast rotator Regulus
Yoichi Takeda
A spectroscopic study of Regulus (late B-type rapidly-rotating star) was conducted with an aim of investigating its photospheric chemical abundances (especially for light elements)…
astro-ph.SR2026
Photospheric abundances of the rapidly-rotating A-type star Altair
Yoichi Takeda
Altair is an A-type star known to have an appreciably oblate shape owing to its very fast rotation (~300 km/s). Despite of numerous publications on this star, its chemical abundanc…
astro-ph.SR2016
Fundamental stellar parameters and age-metallicity relation of Kepler red giants in comparison with theoretical evolutionary tracks
Y. Takeda, A. Tajitsu, B. Sato +3
Spectroscopic parameters (effective temperature, metallicity, etc) were determined for a large sample of ~100 red giants in the Kepler field, for which mass, radius, and evolutiona…