[IAUC] CBET 2731: 20110530 : DWARF NOVA IN PEGASUS (PNV J21095047+1348396)
quai en eps.harvard.edu
quai en eps.harvard.edu
Mie Sep 14 16:18:52 ART 2011
Electronic Telegram No. 2731
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 PEGASUS (PNV J21095047+1348396)
H. Yamaoka, Kyushu University, forwards the discovery by K. Itagaki
(Yamagata, Japan) of a possible nova on May 24.672 UT during a survey program
performed by himself and H. Kaneda (Hokkaido, Japan). The variable, which
was designated PNV J21095047+1348396 when posted on the Central Bureau's TOCP
webpage, was confirmed at unfiltered CCD mag about 11.5 by Itagaki with a
0.60-m reflector on May 24.699, the position measured to be R.A. =
21h09m50s.47, Decl. = +13d48'39".6 (equinox 2000.0); Itagaki has posted his
confirmation image at website URL http://www.k-itagaki.jp/images/pnv.jpg.
Additional approximate magnitudes for PNV J21095047+1348396 (unfiltered CCD
unless noted otherwise): May 17.71, [14.9 (Itagaki, 0.21-m reflector); May
18.76, [12.3 (Itagaki, 180-mm-f.l. telephoto lens); May 25.3, 11.0 (Ernesto
Guido and Giovanni Sostero; remotely with a 0.25-m f/3.4 reflector at the GRAS
Observatory near Mayhill, NM, U.S.A.; position end figures 50s.46, 39".6,
which they also note to be very close to a star of red mag 18.8 in the USNO-
B1.0 catalogue; their image compared to a red Digitized Sky Survey plate from
1991 is posted at website URL http://bit.ly/mycwOt); May 25.676, 11.6 (K.
Kadota, Ageo, Japan; 0.25-m f/5 reflector + SBIG ST-9E camera; position end
figures 50s.47, 39".7; communicated by S. Nakano, Sumoto, Japan; image posted
at URL http://members.jcom.home.ne.jp/kenic-k/image/PNVinPeg-20110525.jpg);
May 26.076, 11.5 (P. Schmeer, Bischmisheim, Germany; visual). Itagaki/Yamaoka
note also that a faint star (mag about 19) is located within several arcsec of
Itagaki's position in the USNO-B1.0 catalogue (position end figures 50s.427,
39".95).
Akira Arai, Koyama Astronomical Observatory, Kyoto Sangyo University,
writes that optical low-dispersion spectroscopic observations (range 400-750
nm; R about 600 at H-alpha) of PNV J21095047+1348396 were made on May 25.67 UT
using the 1.3-m Araki telescope (+ LOSA/F2). The spectrum shows a blue
continuum with H_beta and H_gamma absorptions and no significant blue-shifts.
No obvious line is visible at H_alpha. These suggest that an emission
component of H_alpha could be filling in the absorption line and that the
object is a dwarf nova in outburst. Their spectrum has been posted at website
URL http://www.cc.kyoto-su.ac.jp/~kao/blog/index.php/view/94.
D. D. Balam, Dominion Astrophysical Observatory, National Research Council
of Canada (NRCC); M. L. Graham, Las Cumbres Observatory Global Telescope,
University of California at Santa Barbara; E. Y. Hsiao, Lawrence Berkeley
Laboratory; and D. W. E. Green, Harvard University, report that a spectrogram
(range 382-714 nm, resolution 0.3 nm) of PNV J21095047+1348396, obtained on
May 29.42 UT with the 1.82-m Plaskett Telescope of the NRCC, shows a steep
blue continuum with broad asymmetric Balmer absorption lines. H-alpha
exhibits a broad absorption profile with a sharp (1.2-nm FWHM) central emission
spike.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2011 CBAT
2011 May 30 (CBET 2731) Daniel W. E. Green
Más información sobre la lista de distribución Iauc