207 citations · 893 across the 40 of their papers we have counts for
8 papers · 1 filter
Protoplanetary Disk Evolution in a Low-Metallicity Environment: JWST's First Mid-Infrared Census of Low-Mass Stars
Chikako Yasui, Natsuko Izumi, Masao Saito +3
This study presents the first high-resolution, high-sensitivity mid-infrared (MIR) investigation of protoplanetary disks in a low-metallicity environment, using JWST/NIRCam and MIR…
A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood
Noriyuki Matsunaga, Akinori Itane, Kohei Hattori +28
Metal-deficient stars are important tracers for understanding the early formation of the Galaxy. Recent large-scale surveys with both photometric and spectroscopic data have report…
Possible progression of mass flow processes around young intermediate-mass stars based on high-resolution near-infrared spectroscopy. I. Taurus
Chikako Yasui, Satoshi Hamano, Kei Fukue +12
We used the WINERED spectrograph to perform near-infrared high-resolution spectroscopy (resolving power ,000) of 13 young intermediate-mass stars in the Taurus star-forming…
FeI lines in 0.91-1.33 m spectra of red giants for measuring the microturbulence and metallicities
Sohei Kondo, Kei Fukue, Noriyuki Matsunaga +16
For a detailed analysis of stellar chemical abundances, high-resolution spectra in the optical have mainly been used, while the development of near-infrared (NIR) spectrograph has…
WINERED high-resolution near-infrared line catalog: A-type star
H. Sameshima, Y. Ikeda, N. Matsunaga +13
We present a catalog of absorption lines in the z', Y, and J bands that we identified in 21 Lyn, a slowly rotating A0.5 V star. We detected 155 absorption features in the high-reso…
A newly-identified emission-line region around P Cygni
Misaki Mizumoto, Naoto Kobayashi, Satoshi Hamano +12
We present a high-resolution () near-infrared (9,100-13,500 ) long-slit spectrum of P Cygni obtained with the newly commissioned WINERED spectrograph in Japan.…
Herbig Ae/Be candidate stars in the innermost Galactic disk: Quartet cluster
Chikako Yasui, Naoto Kobayashi, Satoshi Hamano +4
In order to investigate the Galactic-scale environmental effects on the evolution of protoplanetary disks, we explored the near-infrared (NIR) disk fraction of the Quartet cluster,…
Low-metallicity Young Clusters in the Outer Galaxy I. Sh 2-207
Chikako Yasui, Naoto Kobayashi, Alan T. Tokunaga +2
To study star formation in low metallicity environments ([M/H] ~ -1 ,dex), we obtained deep near-infrared (NIR) images of Sh 2-207 (S207), which is an HII region in the outer Galax…