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THE ASTRONOMER Electronic Circular No 2289      2006 Dec 15 16.03UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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GK PERSEI
This 1901 nova has shown an increase in brightness during December 
although it is not clear at this stage whether this represents a 
significant outburst. Please monitor the star and keep the editor 
informed of its progress.

2006 Dec 2.856UT, 13.1 (Eddy Muyllaert); 6.806, 13.2 (Muyllaert); 9.808, 
12.9 (Jose Ripero); 11.819, 12.9 (Ripero); 13.764, 12.9 (Ripero); 
13.885, 12.6 (Patrick Schmeer); 14.324, 12.45 (Mike Linnolt, USA); 
14.719, 12.4 (Schmeer).

V2362 CYGNI
S. Kimeswenger, S. Dalnodar, A. Knapp, J. Schafer, S.
Unterguggenberger, S. Weiss (AI Innsbruck) have reported on Astronomer's 
Telegram 963, changes in the spectrum of this nova which has recently 
started a new decline (cf TA E-Circular 2287):

V2362 Cygni (N Cyg 2006) had the outburst end March or early April
2006 (Nakano, IAUC 8697) and the maximum April, 6. After a rapid
decline (t3 = 19 days) it stopped its decline 4.5 mag below maximum
and thereafter re-brightened (Goranskij et al. ATEL #928). After V2362 
Cygni concluded the re-brightening (2.0 mag) phase (Munari et al. CBET 
769) it started a rapid decline 7 months after maximum.

While the spectroscopy during the plateau changed marginally, the 
P-Cygni absorption changed its velocity to values during main outburst 
(Munari et al. CBET 769). It was classified as Fe II-type CO novae 
(Russell et al. IAUC, 8710). While our spectrum obtained December 7 
still is dominated by the NII+[NII] blend on 570.8nm, NaI+OI blend on 
592.0nm (FWHM approx 80A) and H_alpha (FWHM = 6.8nm) and tiny P-Cygni 
absorptions, the spectra obtained December 13 and 14 with the Innsbruck 
0.60m telescope, are dominated by narrow , but higher, Balmer lines 
(H_alpha FWHM = 3.4nm) and [NII](567.6 nm, FWHM = 3.3nm). Weak emission 
of [OII] 630.0nm, 731.8nm and 732.9nm and [OI] 844.6 nm are also 
visible. The continuum dropped dramatically towards detection limit - 
line contrast H_alpha/continuum changed from 3:1 to 35:1. Although the 
nebular stage clearly started, excitations states of dominating lines 
are still very low. Continuous spectroscopic monitoring is required. The 
spectrum is given at:

http://astro.uibk.ac.at/60cm/V2362Cyg.jpg

Editor: An updated light curve now appears on the TA WWW site at:

http://www.theastronomer.org/vars/2006/V2362CygLC_V6.gif

Arne Henden, Director AAVSO, relays that Aaron Price has added fainter 
comps to VSP from the .dat calibration file, so you can plot your own 
chart using their AAVSO Variable Star Plotter facility at whatever scale 
you need to continue following this nova.  Go to

http://www.aavso.org/observing/charts/acp/

and enter V2362 Cyg in the name field to pull up the chart.

Guy M Hurst