Central Bureau for Astronomical Telegrams
IAUC 8221: DE Cir = Poss. N IN Cir; 2003ir; V838 Mon
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Circular No. 8221
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
DE CIRCINI = POSSIBLE NOVA IN CIRCINUS
W. Liller, Vina del Mar, Chile, writes that an objective-
transmission-diffraction-grating CCD spectrum (75 grooves/mm;
aperture 100x100 mm; 0.20-m Schmidt camera), obtained on Oct.
11.002 UT, shows an exceedingly strong and broad H_alpha emission
line (FWHM at least 5100 km/s); the brightness of its flat maximum
was approximately 7.7 times that of the surrounding continuum. A
spectrogram obtained on Oct. 12.012 shows the H_alpha emission line
basically unchanged, with its maximum brightness now estimated to
be 6.2 times that of the surrounding continuum (FWHM = 5035 km/s).
Photometry by Liller: Oct. 10.991, V = 10.27 +/- 0.03, B-V = +0.39
+/- 0.05; 12.001, V = 10.60 +/- 0.03. L. A. G. Monard, Pretoria,
S. Africa, reports that a CCD image taken on Oct. 11.704 yields mag
9.5 and the following precise position: R.A. = 15h17m52s.48, Decl.
= -61o57'16".4 (equinox 2000.0).
N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation DE Cir has been given to this nova (cf. IAUC 8219).
SUPERNOVA 2003ir IN UGC 3726
Further to IAUC 8214, M. Ganeshalingam and W. Li report the
LOTOSS discovery of an apparent supernova (mag about 18.0) on
unfiltered KAIT images taken on Oct. 11.5 and 12.5 UT. SN 2003ir
is located at R.A. = 7h11m08s.18, Decl. = +25o54'55".0 (equinox
2000.0), which is 15".2 east and 0".5 south of the nucleus of UGC
3726. A KAIT image taken on Apr. 8.2 showed nothing at this
position (limiting mag about 19.0).
V838 MONOCEROTIS
D. K. Lynch and R. W. Russell, The Aerospace Corporation; and
E. Polomski, University of Minnesota, report 3-14 micron
spectroscopy of V838 Mon on Oct. 11.6 and 12.6 UT at the Infrared
Telescope Facility (+ BASS). The object showed a smooth,
monotonically decreasing spectrum toward longer wavelengths, with
possible weak maxima at 8.7 and 10.6 microns. The double-peaked
feature reported in February (IAUC 8078) has vanished, although
there was evidence for a lingering absorption at 10.3 microns. The
spectrum was much broader than can be represented by a Planck
function, more closely resembling a power-law spectrum. Current
infrared magnitudes: L = 3.52 +/- 0.01, M = 2.70 +/- 0.04, and N
(10.5 microns) = 0.67 +/- 0.02. Since February, the object's
brightness appears unchanged at M but has brightened by about half
a magnitude at N.
(C) Copyright 2003 CBAT
2003 October 13 (8221) Daniel W. E. Green
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