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IAUC 7938: N IN M31; V2540 Oph; 2002ec

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IAUC number

                                                  Circular No. 7938
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)

     An independent discovery of one of the apparent novae in M31
reported on IAUC 7937 has been received from M. Fiaschi, F. Di Mille,
and R. Cariolato, Astronomical Observatory 'G. Colombo', Padua, Italy.
The nova is located at R.A. = 0h43m01s.00, Decl. = +41o16'20".3 (equinox
2000.0), which is 189".3 east and 11".4 north of the nucleus of M31.
The CCD images were taken with a 0.41-m reflector through H-alpha, R,
and B filters, yielding the following magnitudes: July 5.97 UT,
R = 17.0; 5.98, V = 17.4; 5.99, B about 18; 11.06, H-alpha = 16.7;
11.99, R about 18 ;12.03, H-alpha = 16.3. An image of the same field
through an H-alpha filter on Jan. 25 UT showed nothing at this position
(limiting mag 17.5).

     R. C. Puetter, Center for Astrophysics and Space Science, University
of California at San Diego; D. K. Lynch, S. Mazuk, R. J. Rudy, C. C.
Venturini, The Aerospace Corporation; and R. B. Perry, NASA Langley
Research Center, report 0.8-2.5 micron spectroscopy using the Lick
Observatory 3-m telescope and Aerospace Corporation Near-Infrared Imaging
Spectrograph on July 17.3 UT, about 172 days after discovery: "The nova
shows a very rich emission line spectrum.  Although He I 1.0830 micron
is the strongest emission line, low excitation features of O I and Fe II
are still present.  The O I lines are fluorescently excited, both by the
continuum and by H I Ly-beta. The so-called one micron iron lines (Fe
II 0.9997, 1.0501, 1.0863, and 1.1126 micron) are the strongest we have
seen in a nova.  The He II lines have not yet appeared nor have the
coronal lines. The H I and He I lines have both narrow (FWHM about 900 km/s)
a broad (FWHM about 3000 km/s) components."
     Visual and CCD magnitude estimates: Feb. 23.33 UT, 9.3 (A. Amorim,
Florianopolis, Brazil); Mar. 8.81, 8.8 (S. Yoshida, Ibaraki, Japan);
Apr. 5.80, 8.8 (A. Pearce, Nedlands, W. Australia); June 2.95, 10.4
(R. Y. Shida, Sao Paulo, Brazil); July 12.13, V = 11.18 +- 0.05 (J.D. West,
Mulvane, KS)

SUPERNOVA 2002ec IN NGC 5910
     M. M. M. Santangelo, Lucca, Italy, reports that patrol CCD images of
NGC 5910 taken with a 0.51-m reflector in the course of the Monte Agliale
Supernova Search on June 15.01 and 26.95 UT show nothing near the position
of SN 2002ec (limiting R mag about 20.0).

                      (C) Copyright 2002 CBAT
2002 July 27                   (7938)          Carl W. Hergenrother

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