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IAUC 8989: V1721 Aql = N Aql 2008

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                                                  Circular No. 8989
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     H. Yamaoka, Kyushu University, reports the discovery by K.
Itagaki (Yamagata, Japan) of a variable star on his CCD survey
image taken on Sept. 22.5 UT with a 0.21-m reflector; a confirming
unfiltered CCD image taken on Sept. 22.586 with a 0.60-m reflector
yields mag about 14.0 and the following precise position:  R.A. =
19h06m28s.58, Decl. = +7o06'44".3 (equinox 2000.0).  Additional
magnitudes from Itagaki (via S. Nakano):  2007 Nov. 2.396, [17.0;
Sept. 22.586, 14.0; 24.489, 14.1; 27.445, 15.8; 29.529, 16.5; Oct.
1.38759, 16.7; 2.421, 16.9; 3.433, 17.1.  The 2MASS catalogue
contains a very faint star with position end figures 28s.60, 44".5.
Following posting on the Central Bureau's unconfirmed-objects
webpage, V. Nevski (Vitebsk, Belarus, 0.30-m reflector) reports
that an unfiltered CCD image obtained on Sept. 22.8 yields red mag
14.0 and position end figures 28s.59, 44".6 for the variable,
adding that nothing is visible at this position on Digitized Sky
Survey images from 1951 July 5 and 1987 July 30 (limiting mag
approximately 20).  E. Y. Hsiao, M. L. Graham, C. J. Pritchet, and
D. D. Balam, University of Victoria, report that a spectrogram
(range 390-703 nm, resolution 0.3 nm), obtained on Sept. 23.16
using the 1.82-m Plaskett Telescope, exhibits a strongly increasing
continuum from 600 to 703 nm with a broad and flat-topped emission
(HWZI about 2700 km/s, 6.5 nm) at the position of H_alpha;
additional details are given on CBET 1512.  E. Kazarovets reports
that the GCVS team assigns the designation V1721 Aql to this object.
     L. A. Helton and C. E. Woodward, University of Minnesota; and
K. Vanlandingham and G. J. Schwarz, West Chester University, report
on Boller-and-Chivens spectroscopic observations (range 380-900 nm;
resolution about 0.28 nm) of this nova that were obtained at the
Steward Observatory Bok 2.29-m telescope on Sept. 25.19 and 25.25
UT.  H_alpha exhibits a very broad (FWHM = 6450 km/s) tri-peaked
profile with emission components at +3020, -140, and -3550 km/s.
Permitted oxygen makes an appearance at 777.3 and 844.6 nm with
broad (FWHM about 7600 and 7500 km/s, respectively), tri-peaked
structure similar to H_alpha.  The spectrum is heavily reddened
with a complete absence of any emission features blueward of
H_alpha.  The high reddening is confirmed by the extinction maps of
Schlegel et al. (1998, Ap.J. 500, 525), which indicate exceedingly
high reddening along this line-of-sight but suffer from very large
uncertainties since b about 0.  Comparison with other novae at a
similar early evolutionary state imply E(B-V) = 3 and a likely
distance of 5 kpc, assuming a maximum absolute V magnitude of -9.

                      (C) Copyright 2008 CBAT
2008 October 3                 (8989)            Daniel W. E. Green

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