[IAUC] IAUC 9064: V2672 Oph = N Oph 2009 [25139-2009/08-R1]

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                                                  Circular No. 9064
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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V2672 OPHIUCHI = NOVA OPHIUCHI 2009
     S. Nakano, Sumoto, Japan; and H. Yamaoka, Kyushu University,
report the discovery by K. Itagaki (Teppo-cho, Yamagata, Japan) of
an apparent nova (mag 10.0) on unfiltered CCD survey frames taken
on Aug. 16.515 UT using a 0.21-m reflector (limiting mag 15), the
position given as R.A. = 17h38m19s.68, Decl. = -26o44'14".0
(equinox 2000.0).  Additional unfiltered magnitudes and position
end figures:  2008 June 10.645, [15.0 (Itagaki); 2009 Aug. 16.526,
10.1, 19s.70, 14".0 (Itagaki, 0.60-m reflector); 16.576, 10.2,
19s.70, 13".8 (K. Kadota, Ageo, Japan, 0.25-m reflector); 17.428,
about 11.1 (Itagaki).  Both Itagaki and Kadota find nothing at this
position on the Digitized Sky Survey (Kadota citing red DSS images
from 1991 and 1996).  Yamaoka finds no object brighter than mag
about 14.0 on a ASAS-3 V-band image taken on 2009 Aug. 14.142.
Other observers have reported additional measured positions and
magnitudes, as reported on CBET 1910, including M. Nissinen and
V.-P. Hentunen (Varkaus, Finland), who could find nothing visible
at the position of the nova on a Palomar Sky Survey DSS image
(limiting red mag 20.8).  Visual magnitude estimate by P. Schmeer,
Bischmisheim, Germany:  Aug. 17.854, 12.6.
     Low-resolution spectroscopy (range 450-800 nm) by K. Ayani, N.
Murakami, K. Hata, A. Tanaka, M. Tachibana, and A. Kanda with the
Bisei Astronomical Observatory 1.01-m telescope on Aug. 17.6 UT
(details on CBET 1911) reveals broad, prominent H_alpha emission
(FWHM about 8000 km/s; equivalent width about 49 nm) upon a red
continuum; broad H_beta emission line also was present.  Medium-
resolution spectroscopy (range 540-670 nm) obtained by U. Munari,
T. Saguner, P. Ochner, A. Siviero, A. Maitan, P. Valisa, S.
Dallaporta, and S. Moretti on Aug. 17.83 with the Asiago
Astrophysical Observatory 1.22-m telescope (details on CBET 1912)
is dominated by a very strong and highly structured H_alpha in
emission (velocity width 11500 km/s at the base) on a featureless
continuum with interstellar Na I and diffuse intertellar bands (at
577.9, 628.4 and 661.4 nm) in strong absorption.  An low-resolution
CCD spectrogram (range 400-870 nm) obtained by Munari et al. on Aug.
17.87 with a 0.6-m telescope at Varese show H_alpha, H_beta, O I
844.6-nm, and possibly He I 706.5-nm emission lines.  Their
photometry shows that the nova faded from V = 12.63 on Aug. 17.47
to V = 13.05 on Aug. 18.49; they add that this appears to be a
highly reddened outburst occurring on a massive white dwarf, not
dissimilar from the U-Sco type of recurrent novae, noting that a
search of plate archives for missed previous outbursts could be
useful.  N. Samus and E. V. Kazarovets report that the GCVS team
has assigned the designation V2672 Oph to this nova.

                      (C) Copyright 2009 CBAT
2009 August 20                 (9064)            Daniel W. E. Green