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Monitoring Observations of the Jupiter-Family Comet 17P/Holmes during 2014 Perihelion Passage
Yuna Grace Kwon, Masateru Ishiguro, Hidekazu Hanayama +15
We performed a monitoring observation of a Jupiter-Family comet, 17P/Holmes, during its 2014 perihelion passage to investigate its secular change in activity. The comet has drawn t…
Sodium Absorption Systems toward SN Ia 2014J Originate on Interstellar Scales
K. Maeda, A. Tajitsu, K. S. Kawabata +21
Na I D absorbing systems toward Type Ia supernovae (SNe Ia) have been intensively studied over the last decade with the aim of finding circumstellar material (CSM), which is an ind…
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…
Optical and Near-Infrared Polarimetry for a Highly Dormant Comet 209P/LINEAR
Daisuke Kuroda, Masateru Ishiguro, Makoto Watanabe +24
We conducted an optical and near-infrared polarimetric observation of the highly dormant Jupiter-Family Comet, 209P/LINEAR. Because of its low activity, we were able to determine t…
High-resolution spectroscopic studies of ultra metal-poor stars found in LAMOST survey
Haining Li, Wako Aoki, Gang Zhao +3
We report on the observations of two ultra metal-poor (UMP) stars with [Fe/H]~-4.0 including one new discovery. The two stars are studied in the on-going and quite efficient projec…
Discovery of a strongly r-process enhanced extremely metal-poor star LAMOST J110901.22+075441.8
Haining Li, Wako Aoki, Satoshi Honda +3
We report the discovery of an extremely metal-poor (EMP) giant, LAMOST J110901.22+075441.8, which exhibits large excess of r-process elements with [Eu/Fe] ~ +1.16. The star is one…