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IAUC 8307: 2004av; V5114 Sgr = N Sgr 2004

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                                                  Circular No. 8307
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2004av IN ESO 571-G15
     Further to IAUC 8305, M. Moore and W. Li report the LOSS
discovery, on KAIT images taken on Mar. 17.35 and 18.35 UT, of an
apparent supernova (mag about 15.8) located at R.A. = 11h40m57s.84,
Decl. = -22o28'53".6 (equinox 2000.0), which is 12".6 west and
15".9 south of the nucleus of ESO 571-G15.  A KAIT image taken on
Mar. 4.32 also showed the new object at mag about 16.8, while an
image taken on Jan. 22.36 showed nothing at this position (limiting
mag about 18.0).
     Further to IAUC 8303, T. Matheson et al. report that a
spectrum of SN 2004av, obtained by P. Berlind on Mar. 19.31 UT,
shows it to be a type-Ia supernova a few days after maximum.
Adopting the NED recession velocity of 7057 km/s for the host
galaxy, the supernova expansion velocity is 9500 km/s for Si II
(rest 635.5 nm).  The spectral-feature age of the supernova is 4
+/- 2 days after maximum light.

     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V5114 Sgr has been given to this nova (cf. IAUC
8306).  H. Sato and T. Nakamura, National Astronomical Observatory,
Tokyo, report that an independent discovery of this nova (at mag
8.9) was made by Yuji Nakamura (Mie prefecture, Japan) on Tri-X
film exposed on Mar. 15.816 UT with a 200-mm f/4 camera lens, the
position given as R.A. = 18h19m30s.4, Decl. = -28o36'41" (equinox
2000.0; uncertainty +/- 30").  H. Yamaoka, University of Kyushu,
reports that V5114 Sgr was not visible on ASAS-3 V images taken on
Mar. 11.37 (limiting mag about 13.5).
     M. Della Valle, Istituto Nazionale di Astrofisica, Arcetri,
Florence; and A. Ederoclite, L. Schmidtobreick, L. Germany, T.
Dall, and I. Saviane, European Southern Observatory, write:
"Preliminary analysis of a spectrum (range 380--900 nm, resolution
48000), obtained on Mar. 18.3 UT at La Silla with the 2.2-m
telescope (+ Fiber-fed Extended Range Optical Spectrograph), shows
that V5114 Sgr is indeed a nova caught near maximum light.  The
spectrum is dominated by H lines, Ca II (mult. 2), and O I (mult.
34, 1) and Na I emission lines.  Fe II emission lines (mult. 74,
55, 49, 42) are also detected, although they are still weak.  All
Balmer lines are flanked by double P-Cyg profiles whose minimum
absorptions give maximum expansion velocities of about 1500 and 800
km/s, respectively.  The equivalent widths of the Na D interstellar
lines (0.11 and 0.10 nm) may suggest that this nova suffers from
moderate absorption."

                      (C) Copyright 2004 CBAT
2004 March 19                  (8307)            Daniel W. E. Green

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