[IAUC] IAUC 9093: V496 Sct = N Sct 2009 [25139-2010/01-R1]

Mar Nov 10 16:04:09 ART 2009

                                                  Circular No. 9093
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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V496 SCUTI = NOVA SCUTI 2009
     S. Nakano, Sumoto, Japan, reports the discovery by H.
Nishimura (Miyawaki, Kakegawa) of a possible nova on two 10-s CCD
frames taken on Nov. 8.370 UT using a Canon EOS 5D camera (+
Minolta 120-mm lens); Nakano has measured mag 8.8 and position R.A.
= 18h43m45s.65, Decl. = -7o36'41".5 (equinox 2000.0; uncertainty
2".0) for the new object from the JPEG discovery image (limiting
mag 12.0).  Nothing is visible at this position on frames taken on
Nov. 7.377 using the same instrumentation (same limiting mag).  E.
Guido and G. Sostero obtained unfiltered CCD images (remotely,
0.25-m reflector, GRAS Observatory) on Nov. 9.08, finding the
presumed nova to be at mag about 8.5 with position end figures
45s.57, 42".0; the extreme stellar crowding due to nearby field
stars makes measurement rather difficult, but a Digitized Sky
Survey plate (limiting red mag about 20) from 1996 Aug. 13 fails to
show a clear pre-outburst precursor; additional details are given
on CBET 2008.  E. V. Kazarovets reports that the GCVS team has
assigned the designation V496 Sct to this object.
     D. Balam, Dominion Astrophysical Observatory, National
Research Council of Canada (NRCC); and G. Sarty, University of
Saskatchewan, write that a spectrogram (range 429-455 nm,
resolution 0.02 nm), obtained with the NRCC 1.82-m Plaskett
telescope on Nov. 10.08 UT, confirms that this object is a nova,
showing H_alpha emission (HWZI about 400 km/s) with a P-Cyg
profile, its absorption minimum being blue-shifted by 700 km/s with
respect to the emission peak.  Additional lines showing P-Cyg
profiles include N II (448.1 nm), Fe II (multiplet 27) at 435.0 and
441.8 nm, and Fe II (multiplet 38) at 452.1 nm.
     U. Munari and A. Siviero, Istituto Nazionale di Astrofisica,
Padova Astronomical Observatory; and L. Buzzi and P. Valisa, Asiago
Novae and Symbiotic Stars (ANS) collaboration, report that low-
resolution, absolute spectrophotometry (range 390-860 nm,
dispersion 0.21 nm/pixel) of the nova were obtained on Nov. 9.779
UT with the 0.6-m telescope of the Schiaparelli Observatory in
Varese.  The spectrum is dominated by emission lines due to Balmer,
Fe II (multiplets 27, 28, 37, 38, 42, 48, 49, 55, and 74), and O I
777.2- and 844.6-nm, all displaying deep P-Cyg profiles, with the
absorption component blue-shifted by 700 km/s from the emission
component.  The mean FWHM of the emission and absorption of the
P-Cyg profiles are 950 and 850 km/s, respectively.  The H_alpha:
H_beta:H_gamma:H_delta integrated emission-flux ratio is 3.68:1.00:
0.23:0.16, and that of O I (777.2 nm)/(844.6 nm) is 0.91.  The
overall aspect is that of a typical nova of the Fe II class,
observed close to maximum brightness.

                      (C) Copyright 2009 CBAT
2009 November 10               (9093)            Daniel W. E. Green