Electronic Telegram No. 894
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


NOVA CYGNI 2007
     J. Kubat and E. Niemczura, Astronomical Institute, Ondrejov, report
on spectra (range 625-675 nm, resolution 13000) of N Cyg 2007 (cf. CBETs
890 and 891) obtained with the Ondrejov 2-m telescope.  The coude
spectrogram from Mar. 17.09 UT shows a broad P-Cyg H_alpha profile with
a relative emission strength being 1.94 that of the continuum, and the
radial velocity of the absorption minimum being -968 km/s.  Narrow
diffuse interstellar bands at 661.4 and 628.4 nm are clearly visible, as
well.  A spectrogram obtained with the Ondrejov echelle spectrograph on
Mar. 17.12 shows double-absorption profiles of Na I D lines.
     A. Klotz reports that a CCD image of N Cyg 2007 was obtained with
the TAROT 0.25-m robotic telescope at Calern Observatory in France on
Mar. 17.150 UT, yielding R = 6.53 +/- 0.05 and the following position:
R.A. = 20h28m12s.52, Decl. = +41o48'37".6 (equinox 2000.0).
     C. Buil, Castanet, France, reports that an optical spectrogram of N
Cyg 2007, obtained on Mar. 17.16 UT with a 0.28-m telescope and a Lhires
spectrograph (resolution 6800 at H_alpha), shows that the absorption
bottom of the P-Cyg profile of H_alpha is blueshifted by 900 km/s with
respect to the emission peak; the FWHM of the H_alpha emission is 1380
km/s, and the intensity of the H_alpha peak is 2.1 times the local
655.0-nm continuum.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 March 18                    (CBET 894)               Daniel W. E. Green