エントリー

Observation

[nova] V5578 Sgr : update spectra

50.png

We update our spectra of V5578 Sgr. Emission lines are gradually evolving.

[nova] Nova Sgr 2011: spectral development

48.png

We found that intriguing features in spectra of V5587 Sgr (Nova Sgr 2011).  It showed a re-growth of absorption components in P-Cygni profiles for H-beta and other lines on 21 Feb. These features are often observed when rebrightening events of classical novae (Tanaka+2010). We continue observations of this object.

[dwarf nova] SDSS J133941.11+484727.5 : spectroscopy on Feb. 9

42.png

We performed spectroscopic observations of SDSS J133941.11+484727.5 on Feb. 9 (UT).

Our preliminary spectrum is shown in the figure.  The prominent H-alpha emission exists in its absorption component. Bload absorption lines are shown for H-beta, H-gamma, H-delta and He I (4471A).  These spectral features also indicate that the object is a dwarf nova as already reported in vsnet-alert 12807, 12816, 12817. The Bowen complex of NIII, CIII are possiblily detected, but He II (4686A) is not seen in our data. These lines are observed during outbursting phase of well observed WZ-Sge stars, WZ Sge, GW Lib and V455 And. Temperatures of excited region of SDSS J1339 might be lower than those in them.  We continue time-resolved observations of this dwarf nova.

[nova] V1280 Sco (= Nova Sco 2007 No.1)

41.png

We start spectroscopic monitorings of V1280 Sco in the season 2011. The Balmer, He I and [O I] emission lines still remain strong on a strong continuum emission as observed in the last summer. These indicate that the nova wind is still strong.

[nova] Nova Sgr 2011

39.png

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

38.png

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

35.jpg

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

33.png

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.

32.png

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

31.png

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.

ページ移動

ユーティリティ

2019/08

S M T W T F S
- - - - 1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

Search

エントリー検索フォーム
キーワード

Feed