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ユーザー「arai6a」の検索結果は以下のとおりです。

[nova] Nova Sgr 2011

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We update spectra of Nova Sagittarii 2011. Fe II emission lines were detected on Jan.29, 30.

[nova] Spectroscopic confirmation of Possible Nova in Sgr

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We performed low-reslution (R~550) spectroscopic observations of the possible nova in Sgr (= PNV J17474639-2335112 listed in the TCOP of CBAT web page) using Araki telescope and LOSA/F2 at Koyama Astronomical Observatory on 2011 January 28.863UT. Our observations were carried out under the cloudy sky. The spectrum of the object shows prominent emission lines in H-alpha, H-beta and O I (777.4 nm) on a highly reddened continuum light. These features suggest that the object would be a classical nova past the maximum light reddened by interstellar mediums.

[dwarf nova] OT J012059.6+325545 : update

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We update our light curves of OT J012059.6+325545. Our latest observations were performed on Jan. 19. The object showed a rapid and deep fading between Jan. 17 and 18. But, a large rebrightening was observed again on Jan. 19. A large spike was also observed at the last part of its rebrightening phase of WZ Sge in 2001 outburst (ref. Ishioka et al. 2002 and http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/wzsge.html). We specurate that this large rebrightening of OT J01205+325545 may be also the last rebrightening of the current rebrightening phase, because the rebrightening phase of OT J01205.6+325545 is very similar to that of WZ Sge.

Possible Nova in M31 : spectroscopic confirmation

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We carried out the low-resolution spectroscopic observations of "Possible Nova in M31" on Jan. 11 according to the discovery by K. Nishiyama and F. Kabashima. Our observations were performed by 1.3m Araki telescope and LOSA/F2 spectrograph. The spectrum shows clearly P-Cygni profiles at H-alpha, H-beta, Fe II and O I lines. The absorption minmum at the H-alpha line is blue-shifted by about 1300km/s. These features indicate that the object is a classical nova in very early phase.

[dwarf nova] MisV1443 (=TCP J06195996+1926590) : spectrum on 10 Jan.

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We obtained a low-resolution spectrum of MisV1443 according to [vsnet-alert 12580] on 10 Jan. using 1.3m Araki telescope. The spectrum of the object shows bload balmer absorption lines and the weak Ha emission line. Our result is consitent with that by 1.82-m Plaskett telescope(*1).

These feature indicate that MisV1443 would be a dwarf nova in outburst

(*1 reference :  http://www.cbat.eps.harvard.edu/unconf/tocp.html)

[dwarf nova] OT J012059.6+325545 : light curves

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The figure shows our preliminary light curves in g' and i' bands. The vertical axis indicates that the relative magnitdues (not apparent magnitudes). We confirmed that the color of the object became red just after the rapid fading. The object is now in a rebrightening phase which is similar to the phase of WZ Sge in 2001 outburst.

[dwarf nova] OT J230425.8+062546 : detection of humps

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 We obtained g'-band light curve of OT J2304 for 140 min on Jan. 04.  We detected a significant hump with amplitudes of ~0.06 mag in g'-band. A time duration of the hump is about 0.07 day in our light curve. More long-duration photometry are needed.

[dwarf nova] OT J230425.8+062546 : g'-band light curve

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We performed time series g'-band photometry of OT J230425.8+062546 (hear after J2304) for 2 hours on Jan. 3  using Araki telescope with ADLER. Our light curve of the object is shown in the figure(red data). We possibly detected a small variation with amplitudes of 0.03--0.05 mag during our run.  No other significant variations were detected. This featur of light curve was also detected at Osaka Kyoiku University tonight. Spectra of J2304 suggest that it would be dwarf nova (c.f. CBET 2617 and our spectrum). The current outburst of J2304 does not look like a normal outburst because of a large amplitudes. Ordinary SU-UMa dwarf novae show superhumps with amplitudes > 0.1 mag from its early phase.  Our result implies that J2304 might be a WZ Sge star viewed nearly face-on.

[dwarf nova] Otpical transient in Psc = OT J230425.8+062546 : a spectrum

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We obtained an optical spectrum of a new transient in Psc (= OT J230425.8+062546) using 1.3m Araki telescope with LOSA/F2(R~550) on Jan.03. The object was discovered by H. Nishiura on 2010 Dec. 29(c.f. CBET 2616). The figure shows our preliminary results of a spectrum of the object. The spectra shows absorptions of H-beta, H-gamma and a emission of H-alpha on a blue continuum.   These results suggest that the object would be a dwarf nova as reported by the other observers (c.f. CBET 2617).

[dwarf nova] OT J012059.6+325545 : spectrum in rebrightening phase

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We obtained a spectum of OT J012059.6+32554 on Dec.29. The spectrum shows the strong H-alpha emission. On the other hand, we detected that the H-beta line shows an emission feature and the H-gamma shows an absorption feature. These features imply that the accretion disk is still hot.

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