[IAUC] CBET 2813: 20110910 : NOVA SCORPII 2011 No. 2 = PNV J16364440-4132340 = PNV J16364300-4132460

Vie Sep 9 20:50:37 ART 2011

                                                  Electronic Telegram No. 2813
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


NOVA SCORPII 2011 No. 2 = PNV J16364440-4132340 = PNV J16364300-4132460
     Two independent discoveries of an apparent nova in Scorpius have been
received by the Central Bureau.  John Seach (Chatsworth Island, NSW, Australia)
reported finding a star of mag 9.8 on four CCD images taken on Sept. 6.37 UT
with a digital single-lens-reflex camera (+ 50-mm f/1.2 lens; limiting mag
10.5), with the position given as R.A. = 16h36m43s, Decl. = -41d32'46"
(equinox 2000.0), adding that nothing was visible at this position on his
image taken on Sept. 5.36 (limiting mag 10.5).  H. Yamaoka, Kyushu University,
forwards a report that Yuji Nakamura (Kameyama, Mie, Japan) discovered this
possible nova at mag about 9.7 on five unfiltered CCD images taken with a
150-mm-focal-length telephoto lens on Sept. 6.431; Nakamura measured the
position of the new object as R.A. = 16h36m44s.4, Decl. = -41d32'34"
(uncertainty about 30"), adding that nothing is visible at this position on
his image taken on Aug. 29.451 (limiting mag about 12.0).  When Yamaoka
posted Nakamura's discovery observation on the Central Bureau's Transient
Object Confirmation Page, it was assigned the designation PNV
J16364440-4132340 was assigned; the posting of Seach's discovery observation
yielded a second designation, PNV J16364300-4132460.
     Additional magnitudes for PNV J16364440-4132340 = PNV J16364300-4132460,
visual unless noted otherwise (some reported via E. Waagen, AAVSO):
Sept. 7.46 UT, I_c = 8.62, R_c = 9.48, V = 10.51 (Hiroyuki Maehara, Kwasan
Observatory, Kyoto University; 0.25-m telescope); 7.48, V = 10.52 (Steve
James, Queanbeyan, NSW, Australia); 7.50, 9.1 (Ernesto Guido, Nick Howes, and
Giovanni Sostero; remotely through the 2.0-m f/10 Ritchey-Chretien "Faulkes
Telescope South" + Bessel R filter; position end figures 44s.29, 37".7;
USNO-B1.0-catalogue reference stars); 7.507, V = 10.44 (Peter Lake, Wonga
Park, Victoria, Australia); 7.509, V = 10.40 (Lake); 7.512, V = 10.41 (Lake);
7.514, V = 10.42 (Lake); 7.516, V = 10.38 (Lake); 7.53, B = 11.88, V = 10.73,
R_c = 9.75, I_c = 8.77 (Seiichiro Kiyota, Tsukuba, Japan, remotely using a
31.7-cm Global-rent-a-scope + SBIG ST-10 camera at Officer, Australia;
position end figures 44s.28, 37".6); 7.545, 10.6 (Rod Stubbings, Tetoora
Park, Victoria, Australia); 7.545, 10.6 (Stubbings); 8.392, 11.0 (Stubbings);
9.406, 10.3 (T. Noguchi, Chiba-ken, Japan, 0.23-m Schmidt-Cassegrain
reflector + unfiltered BITRAN BT-11E CCD camera; limiting magnitude 16.5;
position end figures 44s.26, 37".4; UCAC3 reference stars; communicated by
Syuichi Nakano, Sumoto, Japan).  Kiyota's images is posted at website URL
http://meineko.sakura.ne.jp/ccd/PNV_J16364440-4132340-110907.jpg.
     Guido et al. add that a USNO-B1.0-catalogue star with red mag 15.08
appears very close to the position (within 0".06) of the variable, and they
have posted a comparison animation with a 1997 red Digitized Sky Survey (DSS)
plate at website URL http://bit.ly/ojz76D.  Paul Camilleri (New Castle, NSW,
Australia) and Steven Williams (Sydney, NSW) write that they obtained images
with red, blue, and green filters remotely using a 0.35m f/6 reflector (+ ST8
camera) at Grove Creek/Skylive Observatory, Trunkey Creek, NSW, yielding
position end figures 44s.28, 37".7 and red mag 9.7 for the variable (no date
given); they add that a star of mag 14-15 is visible on 1.2-m U.K. Schmidt
Telescope plates, providing position end figures 44s.29, 37".6 from DSS images
(mag 14.3 measured from an infrared plate taken on 1980 May 5.63; mag 15.2
measured from a red IIIa-F plate + OG590 filter on 1997 Apr. 30.64).

     A. Arai, T. Kajikawa, C. Naka, Kyoto Sangyo University, write that they
performed low-resolution optical spectroscopic observations (R about 580) of
PNV J16364440-4132340 on Sept. 7.42 UT using the Araki telescope at Koyama
Astronomical Observatory.  The spectrum exhibits broad Balmer emissions and
Fe II multiplet emissions on a highly reddened continuum light.  The H-alpha
emission line shows an asymmetric profile with FWZI about 6000 km/s.  Other
significant features are invisible in the spectrum (posted at website URL
http://www.cc.kyoto-su.ac.jp/~kao/blog/index.php/view/127).  These features
suggest that the object is an "Fe II"-type classical nova, highly reddened
by the interstellar medium.
     F. Walter, Stony Brook University; and J. Seron, Cerro Tololo
Interamerican Observatory (CTIO), confirm that PNV J16364300-4132460 is a
galactic nova.  A spectrum obtained on Sept. 8.091 UT with the SMARTS/CTIO
1.5-m reflector (+ RC spectrograph; range 565-695 nm; resolution 0.31 nm)
shows broad H-alpha emission with a triple-peaked spectrum reminiscent of
early recurrent-novae spectra; the FWHM of the line is about 3000 km/s, and
the equivalent width is about 19.0 nm.  The nova is young; the continuum
shows a number of broad absorption lines, as well as narrow interstellar Na D
absorption (EW about 0.36 nm).  No emission is evident aside from H-alpha.


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                         (C) Copyright 2011 CBAT
2011 September 10                (CBET 2813)              Daniel W. E. Green