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IAUC 7822: V838 Mon; 2002ap; C/2002 C1

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                                                  Circular No. 7822
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
Phone 617-495-7440/7244/7444 (for emergency use only)

     T. Iijima, Padua Astronomical Observatory, Asiago; and M.
Della Valle, Arcetri Astrophysical Observatory, Florence,
communicate: "High-dispersion spectra (range 430-690 nm, resolution
0.06 nm) of V838 Mon were taken on Feb. 1.92, 2.93, and 3.95 UT
with the Padua/Asiago 1.82-m telescope (+ echelle spectrograph).
The spectral features drastically changed between Feb. 1 and 2.  In
addition to the emission lines of Na I and Ba II, which were
visible in early spectra (IAUC 7785, 7786, 7812), many lines of
ionized metals (Fe II, Ti II, Cr II, Mg II, Si II, etc.) emerged.
Most of the metallic emission lines are flanked by P-Cyg-type
absorption components, blueshifted by about -120 km/s.  H_alpha
exhibits 'narrow' emission (FWHM about 160 km/s) flanked by a P-Cyg
absorption component blueshifted by -150 km/s.  The 'narrow'
component of H_alpha is superimposed on a 'broad' emission
characterized by a FWZI of about 2800 km/s.  This peculiar object
seems to be undergoing a normal nova explosion."
     Visual magnitude estimates:  Feb. 2.983 UT, 7.8 (A. Kammerer,
Ettlingen, Germany); 4.042, 7.3 (J. Garcia, Rama Caida, Argentina);
5.038, 7.1 (R. Y. Shida, Sao Paulo, Brazil); 5.740, 6.7 (L. Kiss,
Piszkesteto, Hungary); 7.530, 6.8 (A. Pearce, Nedlands, W.
Australia); 8.784, 7.3 (K. Hornoch, Lelekovice, Czech Republic).

     S. Smartt, Institute of Astronomy, Cambridge; and P. Meikle,
Imperial College, London, write:  "A spectrum (range 569-610 nm;
resolution 0.08 nm) of SN 2002ap, obtained with the William
Herschel Telescope at La Palma on Feb. 2.9 UT by C. Benn, shows
absorption features of the interstellar-medium lines Na I (588.995
and 589.592 nm) shifted by +631 km/s.  This matches the redshift of
M74 and confirms that SN 2002ap is indeed associated with that host
galaxy.  We see no higher redshifted components in this spectrum
(continuum signal-to-noise = 130), which suggests that SN 2002ap is
not behind M74 in an unassociated galaxy."

     Visual m_1 estimates:  Feb. 3.74 UT, 8.0 (M. Meyer, Hohe
Wurzel, Germany, 20x100 binoculars); 5.13, 7.8 (C. S. Morris,
Fillmore, CA, 20x80 binoculars); 7.53, 7.9 (A. Pearce, Nedlands,
W. Australia, 20x80 binoculars); 8.42, 7.9 (D. A. J. Seargent, The
Entrance, N.S.W., 25x100 binoculars); 9.40, 7.4 (Y. Nagai,
Yamanashi, Japan, 20x100 binoculars).

                      (C) Copyright 2002 CBAT
2002 February 9                (7822)            Daniel W. E. Green

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