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12 papers · 1 filter
Optical Spectroscopic Monitoring Observations of a T Tauri Star V409 Tau
Hinako Akimoto, Yoichi Itoh
We report the results of optical spectroscopic monitoring observations of a T Tauri star, V409 Tau. A previous photometric study indicated that this star experienced dimming events…
LAMOST J2217+2104: a new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si
Wako Aoki, Tadafumi Matsuno, Satoshi Honda +4
We report on the elemental abundances of the carbon-enhanced metal-poor (CEMP) star J2217+2104 discovered by our metal-poor star survey with LAMOST and Subaru. This object is a red…
Linear nonadiabatic pulsation models of the double-mode Cepheid V371 Per
Toshihito Ishida
Recently found double-mode Cepheid with the shortest period in our galaxy and abnormal period ratio, V371 Per is investigated by linear nonadiabatic pulsation models. V371 Per is l…
High-resolution spectroscopy of the extremely iron-poor post-AGB star CC Lyr
Wako Aoki, Tadafumi Matsuno, Satoshi Honda +3
High-resolution optical spectroscopy was conducted for the metal-poor post-AGB star CC Lyr to determine its chemical abundances and spectral line profiles. Our standard abundance a…
Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data
Hiroyuki Maehara, Takuya Shibayama, Yuta Notsu +4
We searched for superflares on solar-type stars using the Kepler short-cadence (1-min sampling) data in order to detect superflares with short duration. We found 187 superflares on…
High dispersion spectroscopy of solar-type superflare stars with Subaru/HDS
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
We carried out spectroscopic observations with Subaru/HDS of 50 solar-type superflare stars found from Kepler data. More than half (34 stars) of the target stars show no evidence o…