Hiroko Ito   Wako Aoki   Satoshi Honda   Timothy C. Beers   Nozomu Tominaga   
LIGHT ELEMENTS IN THE UNIVERSE 268(268) 337-+ 2010年 [査読有り]
We performed a 1D LTE chemical abundance analysis of an extremely metal-poor star BD+44 degrees 493 ([Fe/H] = -3.7), and set a very low upper limit for its Be abundance A(Be) < -2.0 It may include that the decreasing trend of Be abundances with...
We have determined the isotopic abundance ratio of Li-7/Li-6 in the interstellar media (ISMs) along lines of sight to HD169454 and HD250290 using the High-Dispersion Spectrograph on the Subaru Telescope. We also observed zeta Oph for comparison wi...
ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XVIII 411 396-+ 2009年 [査読有り]
The Japanese Virtual Observatory (JVO) is a web portal for astronomical data and analysis system, and utilizes the standards developed by the IVOA to communicate with the VO-compliant resources in the world. We started official operation of the JV...
EIGHTH PACIFIC RIM CONFERENCE ON STELLAR ASTROPHYSICS: A TRIBUTE TO KAM-CHING LEUNG 404 52-+ 2009年 [査読有り]
We carried out intensive spectroscopic observations of two WZ Sge-type dwarf novae, GIN Lib, and V455 And during their superoutbursts in 2007, at 6 observatories. The observations covered the whole of both superoutbursts from the very maximum to t...
Astrophysical Journal 707(2 PART 2) L118-L122 2009年 [査読有り]
We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of the light curve is Δm15(B) = 0.65 0.03, which is one of the slowest among SNe Ia. The pea...
Yuta Notsu   Adam F. Kowalski   Hiroyuki Maehara   Kosuke Namekata   Satoshi Honda   Teruaki Enoto   Kenji Hamaguchi   Isaiah Tristan   Suzanne L. Hawley   James R. A. Davenport   Soshi Okamoto   Kai Ikuta   Daisaku Nogami   Kazunari Shibata   
2021年7月
Flares are releases of magnetic energy in the stellar atmosphere, and they have strong emissions from radio to X-rays. During some M dwarf flares, chromospheric line profiles show blue asymmetries, although red asymmetries are more commonly observ...
Solar and stellar flares are caused by the sudden release of magnetic energy on the surfaces. In the case of the Sun, mass ejections often accompany solar flares and affect the Earth’s environment. Active solar-type stars (G-type main-sequence sta...