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IAUC 7193: V382 Vel; SNe

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                                                  Circular No. 7193
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 617-495-7244/7440/7444 (for emergency use only)

     M. Della Valle, European Southern Observatory (ESO) and Padova
University; L. Pasquini, ESO; and R. Williams, Max-Plank-Institut
fur Astrophysik, Garching, and Space Telescope Science Institute,
report: "Preliminary analysis of spectra of N Vel 99 collected from
May 28 to date, as part of a target-of-opportunity campaign at ESO
with the 1.5-m telescope (+ Fiber-fed Extended Range Optical
Spectrograph; range 390-900 nm, resolution 48 000), shows the
continuum of the nova dominated by emission lines of the Balmer
series with associated weak P-Cyg profiles, O I (multiplets 1, 4),
Fe II (multiplets 27, 28, 38, 42, 48, 49, 74), N II, and Na I lines
(D2 and D1 interstellar lines having EW = 0.039 and 0.037 nm).  The
[O III] forbidden-line identification reported by Hidayat et al.
(IAUC 7188) at 500.7 nm is more likely to be the Fe II line (mult.
42) at 501.8 nm.  The expansion velocities derived from the minima
of the Balmer line P-Cyg profiles range between 2300 and 2400 km/s,
whereas the HWZI measured for H-alpha yields 3600 km/s.  The strong
presence of Fe II lines, characterized by 'flat top' profiles and
high expansion velocities, suggest this nova to have formed the
lines in the discrete shell and thus to belong to the class of
'broad' Fe II novae (Fe II-b; see Williams 1992, A.J. 104, 725).
The analysis of the preliminary lightcurve finds t_2 about 6 days
and t_3 about 10 days.  By combining these figures with the maximum
magnitude vs. rate-of-decline relationship for classical novae
(Della Valle and Livio 1995, Ap.J. 452, 704), we find an absolute
magnitude at maximum of M_V about -8.7 +/- 0.2 (1-sigma) (cf. IAUC
     Further selected visual magnitude estimates:  June 1.901 UT,
5.3 (T. A. Napoleao, S ao Paulo, Brazil); 3.902, 5.6 (W. C. de
Souza, Sao Paulo, Brazil); 4.432, 5.7 (A. Pearce, Nedlands, W.
Australia); 5.883, 6.1 (J. G. de S. Aguiar, Joaquim Egidio, Brazil);
6.436, 5.8 (Pearce); 7.439, 6.0 (Pearce).

     R. Szabo reports CCD R magnitude estimates of various
supernovae using the 1-m telescope at Piszkesteto, Hungary (based
on USNO-A1.0 R magnitudes):  SN 1999bg in IC 758, May 25.999 UT,
15.6; SN 1999bh in NGC 3435, May 25.936, 18.6; SN 1999br in NGC
4900, May 26.816, 16.8; SN 1999bt, May 26.027, 19.0; SN 1999bu in
NGC 3786, May 25.965, 18.7; SN 1999bv in MCG +10-25-14, May 26.036,
18.0; SN 1999bw in NGC 3198, May 25.821, 18.5; SN 1999bx in NGC
6745, May 26.076, 19.0; SN 1999cb in Mkn 881, May 25.068, 17.7; SN
1999cc in NGC 6038, May 25.058, 16.7.

                      (C) Copyright 1999 CBAT
1999 June 7                    (7193)            Daniel W. E. Green

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