99 citations · 673 across the 22 of their papers we have counts for
22 papers
Evaluation of the Vertical Scale Height of L dwarfs in the Galactic Thin Disk
Satoko Sorahana, Tadashi Nakajima, Yoshiki Matsuoka
Using the data release 1 of the Hyper Suprime-Cam Subaru Strategic Program covering about 130 square degrees at high galactic latitudes, we have obtained L dwarf counts based on th…
Carbon-to-Oxygen Ratios in M dwarfs and Solar-type stars
Tadashi Nakajima, Satoko Sorahana
Initial C/O ratios of circumstellar disks have been obtained in solar-type stars by differential photospheric abundance analysis with respect to the Sun. We present C/O ratios of M…
Near infrared spectroscopy of M dwarfs. III. Carbon and oxygen abundances in late M dwarfs including the dusty rapid rotator 2MASSI J1835379+325954
Takashi Tsuji, Tadashi Nakajima
Carbon and oxygen abundances of eight late M dwarfs are determined based on the near IR spectra of medium resolution. Seven objects with T_eff above 2600K are analyzed with the dus…
Physical Properties of Gliese 229B Based on Newly Determined Carbon and Oxygen Abundances of Gliese 229A
Tadashi Nakajima, Takashi Tsuji, Yoichi Takeda
Recently Tsuji & Nakajima (2914) and Tsuji, Nakajima & Takeda (2015) have developed a method of molecular line spectroscopy of M dwarfs with which Carbon and oxygen abundances are…
Near Infrared Spectroscopy of M Dwarfs. II. H2O Molecule as an Abundance Indicator of Oxygen
Takashi Tsuji, Tadashi Nakajima, Yoichi Takeda
Based on the near infrared spectra (R~20000) of M dwarfs, oxygen abundances are determined from the ro-vibrational lines of H2O. Although H2O lines in M dwarfs are badly blended ea…
Near Infrared Spectroscopy of M Dwarfs. I. CO Molecule as an Abundance Indicator of Carbon
Takashi Tsuji, Tadashi Nakajima
Based on the near infrared spectra of 42 M dwarfs, carbon abundances are determined from the ro-vibrational lines of CO 2-0 band. We use Teff values based on the angular diameters…