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Spectroscopic observations of active solar-analog stars having high X-ray luminosity, as a proxy of superflare stars
Yuta Notsu, Satoshi Honda, Hiroyuki Maehara +4
Recent studies of solar-type superflare stars have suggested that even old slowly rotating stars similar to the Sun can have large starspots and superflares. We conducted high disp…
Validation of a Scaling Law for the Coronal Magnetic Field Strengths and Loop Lengths of Solar and Stellar Flares
Kosuke Namekata, Takahito Sakaue, Kyoko Watanabe +2
Shibata & Yokoyama (1999, 2002) proposed a method of estimating the coronal magnetic field strengths () and magnetic loop lengths () of solar and stellar flares, on the basis…
Superoutburst of WZ Sge-type Dwarf Nova Below the Period Minimum: ASASSN-15po
Kosuke Namekata, Keisuke Isogai, Taichi Kato +38
We report on a superoutburst of a WZ Sge-type dwarf nova (DN), ASASSN-15po. The light curve showed the main superoutburst and multiple rebrightenings. In this outburst, we observed…
Statistical properties of superflares on solar-type stars with Kepler data
Yuta Notsu, Hiroyuki Maehara, Takuya Shibayama +5
Superflares are flares that release total energy 1010 times greater than that of the biggest solar flares with energy of 10 erg. We searched superflares on…