[IAUC] CBET 3554: 20130611 : DWARF NOVA IN AQUILA = PNV J19150199+0719471

Mar Jun 11 14:36:47 ART 2013

                                                  Electronic Telegram No. 3554
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


DWARF NOVA IN AQUILA = PNV J19150199+0719471
     K. Itagaki, Yamagata, Japan, reported the discovery of a possible nova
(mag 10.8) on an unfiltered CCD survey image taken with a 0.21-m reflector on
May 31.597 UT, with the position of the variable given as R.A. = 19h15m01s.99,
Decl. = +7d19'47".1 (equinox 2000.0); he posted his image at website URL
http://www.k-itagaki.jp/images/pnv-aql.jpg.  The variable was designated PNV
J19150199+0719471 when it was posted at the Central Bureau's TOCP webpage.
Additional CCD magnitudes for the variable:  May 21.608, [15.5 (Itagaki);
30.721, 9.8 (Tadashi Kojima, Tsumagoi, Agatsuma-gun, Gunma-ken, Japan; Canon
EOS 60D Digital camera + 85-mm f/2.8 lens; limiting mag 13; pre-discovery;
communicated by S. Nakano, Sumoto, Japan); 31.627, 10.3 (Kojima; limiting mag
12.5); 31.647, 10.0 (Yukio Sakurai, Mito, Ibaraki-ken, Japan; Fuji FinePix S2
Digital Camera + Nikon 180-mm f/2.8 lens; nothing visible on an image taken
on May 17 UT; communicated by Nakano); 31.654, 11.0 (Y. Nakamura, Kameyama,
Mie, Japan; 0.36-m reflector; independent discovery with no details via a
CCD image taken with a 135-mm telephoto lens on May 30.749, the new object
blended with a red star about 20" to the south; communicated by H. Yamaoka,
Kyushu University); June 1.327, B = 10.5, V = 10.4, R = 10.6 (T. Yusa, Osaki,
Japan; remotely using an iTelescope 0.25-m f/3.4 hyperbolic astrograph +
SBIG ST-10XME camera near Mayhill, NM, U.S.A.; position end figures 02s.04,
46".6; UCAC-4 reference stars; BVR color composite image posted at website URL
http://space.geocities.jp/yusastar77/supernova/PNinAql_130601.htm); 1.941, V =
10.80, B-V = -0.07, V-R_c = +0.04, V-I_c = -0.04 (S. Dallaporta and U. Munari,
ANS Collaboration); 2.003, V = 10.7 (P. Brlas, Hungary; communicated by E.
Waagen, AAVSO); 2.275, V = 10.88 (F. Guenther, Frederick, MD, U.S.A.;
communicated by Waagen); 2.277, B = 10.93 (Guenther); 2.289, V = 10.88 (A.
Oksanen, Muurame, Finland; communicated by Waagen); 2.428, V = 10.95 (J.
Hambsch, Mol, Belgium; communicated by Waagen); 2.429, I = 10.99 (Hambsch);
2.941, V = 10.99 (P. Hallsten, Vasterhaninge, Sweden; communicated by Waagen);
3.011, B = 11.09 (L. Izzo, Rome, Italy; communicated by Waagen); 3.013, V =
10.99 (Izzo); 3.014, R = 11.02 (Izzo); 3.015, I = 11.14 (Izzo); 3.141, V =
11.14 (Hambsch); 3.404, V = 11.10 (Oksanen); 3.548, 11.5 (Toshihide Noguchi,
Katori, Chiba-ken, Japan; 0.23-m f/6.3 reflector + BITRAN BT-11E camera;
position end figures 02s.00, 47".1; limiting mag 17.0; UCAC3 reference stars;
image posted at website URL http://park8.wakwak.com/~ngc/images/PNVinAql.jpg;
communicated by Nakano); 4.175, V = 11.32 (Hambsch); 4.416, V = 11.29
(Oksanen); 5.276, V = 11.44 (Guenther); 5.279, B = 11.58 (Guenther); 6.200, V
= 11.64 (Hambsch); 7.427, V = 11.96 (Hambsch); 9.264, V = 12.1 (Brlas);
10.054, V = 11.98 (R. Pickard, Leominster, England; via Waagen); 10.351, V =
11.97 (Oksanen); 11.004, V = 12.06 (Izzo); 11.006, R = 12.02, B = 12.20
(Izzo); 11.007, I = 12.04 (Izzo).  Visual magnitude estimates communicated by
Waagen:  June 1.951, 10.3 (D. Blane, Henley-on-Klip, South Africa); 2.019,
10.8 (G. Poyner, Birmingham, England); 2.392, 10.5 (A. Dill, Wichita, KS,
U.S.A.); 2.990, 10.8 (B. Billiaert, Duffel, Belgium); 3.082, 11.1 (A. Amorim,
Florianopolis, Brazil); 3.952, 11.2 (Billiaert); 4.132, 11.2 (L. Shotter,
Uniontown, PA, U.S.A.); 4.215, 11.0 (M. Komorous, London, ON, Canada); 5.020,
11.4 (A. Glez-Herrera, Ferrol, Spain); 6.174, 11.7 (S. Aguirre, Hermosillo,
Mexico); 7.149, 11.7 (K. Wenzel, Grossostheim, Germany); 8.920, 11.8 (Wenzel);
9.208, 11.6 (Komorous); 10.928, 11.9 (Billiaert).

     R. M. Wagner and D. Mudd, Ohio State University; C. E. Woodward,
University of Minnesota; S. G. Starrfield, Arizona State University; and G.
Schwarz, American Astronomical Society, obtained optical spectra (range
320-640 nm; resolution 0.6 nm) on June 2.44 and 4.45 UT using the McGraw Hill
1.3-m telescope of the MDM Observatory on Kitt Peak of PNV J19150199+0719471.
The spectra exhibit Balmer and He I 447.1-nm absorption lines superposed on a
blue continuum.  A weak and variable emission-line core may also be present.
The equivalent widths of the H-beta and H-gamma absorption lines were 0.35
and 0.41 nm on June 2.44, and 0.45 and 0.48 nm on June 4.45, respectively.
The width of H-gamma absorption was 3.1 nm on June 2.44.  No strong emission
lines characteristic of a classical nova outburst were evident.  The
appearance of the spectrum, line profiles, and widths suggests that the new
object is a dwarf nova discovered during outburst.  Further observations are
encouraged to search for periodic photometric modulations and to monitor the
spectral evolution.
     E. O. Waagen, AAVSO, notes that PNV J19150199+0719471is a probable
"WZ Sge"-type cataclysmic variable, adding that superhumps have become
visible in the photometric data.


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                         (C) Copyright 2013 CBAT
2013 June 11                     (CBET 3554)              Daniel W. E. Green