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Photometric and Spectroscopic Observations of V1280 Sco
Hiroyuki Naito, Sahori Mizoguchi, Akira Arai +4
Photometries of B, V, Rc, Ic, y, J, and Ks bands and low dispersion optical spectroscopic observations of Nova V1280 Sco, started soon after the outburst, are reported. We show tha…
Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716714
Mahito Sasada, Makoto Uemura, Akira Arai +7
We present the result of near-infrared and optical observations of the BL Lac object S5 0716714 carried out by the KANATA telescope. S5 0716714 has both a long term high-…
Science with UT's Dichroic-Mirror Camera (DMC), 15-band simultaneous imager
Hanindyo Kuncarayakti, Mamoru Doi, Hakim L. Malasan +20
We introduce the Dichroic-Mirror Camera (DMC), an instrument developed at the University of Tokyo which is capable of performing simultaneous imaging in fifteen bands. The main fea…
The 2006 November outburst of EG Aquarii: the SU UMa nature revealed
Akira Imada, Rod Stubbings, Taichi Kato +32
We report time-resolved CCD photometry of the cataclysmic variable EG Aquarii during the 2006 November outburst During the outburst, superhumps were unambiguously detected with a m…
Outburst of a WZ Sge-type dwarf nova, AL Com in 2007
M. Uemura, A. Arai, M. Sasada +8
We report photometric observations of AL Com during its rare outburst in 2007. The light curve is reminiscent of its past superoutbursts in 1995 and 2001, except for the rebrighten…
Chemical Abundances in the Secondary Star of the Black Hole Binary V4641 Sagittarii (SAX J1819.3-2525)
Kozo Sadakane, Akira Arai, Wako Aoki +10
We report on detailed spectroscopic studies performed for the secondary star in the black hole binary (micro-quasar) V4641 Sgr in order to examine its surface chemical composition…