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IAUC 8082: 2003bf, 2003bg; V838 Mon

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                                                  Circular No. 8082
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
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SUPERNOVAE 2003bf AND 2003bg
     Two additional apparent supernovae have been reported on
unfiltered CCD images, SN 2003bf by W. M. Wood-Vasey et al.
(cf. IAUC 8079) from NEAT Haleakala images and SN 2003bg by R.
Chassagne (cf. IAUC 7987).

SN      2003 UT       R.A.  (2000.0)  Decl.   Mag.      Offset
2003bf  Feb. 18.45   8 08 26.35  +12 19 56.2  17.6   3".6 W, 1".4 S
2003bg  Feb. 25.7    4 10 59.42  -31 24 50.3  15.0:  16".3 W, 24".6 S

Additional magnitudes from the respective discoverers:  SN 2003bf,
Feb. 3.24, [20.8; 21.35, 17.2.  SN 2003bg in MCG -05-10-15, 1979
Dec. 11.5 UT, 19.5 (Digitized Sky Survey); 2002 Nov. 7.0, [18.0:;
2003 Feb. 26.6, 15.0:.

     L. S. Bernstein, Spectral Sciences, Inc.; R. J. Rudy, D. K.
Lynch, W. L. Dimpfl, S. Mazuk, and C. C. Venturini, The Aerospace
Corporation; R. C. Puetter, Center for Astrophysics and Space
Science, University of California, San Diego; and R. B. Perry,
Langley Research Center, NASA, report the presence, in a 0.8-2.5-
micron spectrum of V838 Mon obtained on 2002 Dec. 19 UT at the Lick
Observatory 3-m telescope (+ Aerospace Near Infrared Imaging
Spectrograph), of significant absorption features due to aluminum
oxide (detected previously but not identified; cf. IAUC 8016, 8036).
Also visible are the previously reported absorptions due to water
vapor and CO.  The AlO features are the A-X (4,0) doublet, with
peak absorptions at 1.225 and 1.244 microns, and the A-X (2,0)
doublet at 1.650 and 1.687 microns.  The other AlO A-X bands in the
vibrational sequence are less evident due to masking by much
stronger water features.  A very deep, broad absorption at 1.05
microns is tentatively identified as a combination of the AlO A-X
(6,0) transition and the vanadium-oxide (VO) A-X (0,0) feature seen
in the spectra of late-type stars.  Because the AlO and VO features
arise directly from the ground electronic-vibration level, they can
exhibit strong absorption at the atypically low temperature
(approximately 600 K) indicated by the water and CO spectral
absorption profiles.  Other VO features are also evident, including
the A-X (1,0), (2,0), and (3,0) bands, and the B-X (0,0) and (0,1)
bands.  In contrast, titanium oxide, which frequently dominates the
spectra of late-type stars, is less apparent in these near-infrared
data, with only the E-X (0,0) band at 0.84 micron appearing as an
underlying contribution to the stronger VO B-X (0,1) band.  Further
spectroscopic observations of V838 Mon are urged, as its envelope
is chemically active and evolving.

                      (C) Copyright 2003 CBAT
2003 February 27               (8082)            Daniel W. E. Green

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