[IAUC] CBET 891: 20070317 : NOVA CYGNI 2007

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                                                  Electronic Telegram No. 891
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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NOVA CYGNI 2007
     K. Ayani, Bisei Astronomical Observatory (BAO), writes that
low-resolution spectra (range 380-800 nm; resolution 0.55 nm at H_alpha)
of the possible nova in Cygnus reported on CBAT 890, obtained with
the BAO 1.01-m telescope on Mar. 16.8 UT, show that the variable is a
nova.  The spectra show Balmer and Fe II absorption lines on a red
continuum.  The H_alpha line has a P-Cyg profile whose absorption bottom
is blueshifted by 1200 km/s with respect to the emission peak.
     H. Naito and M. Sakamoto, Nishi-Harima Astronomical Observatory,
report that they obtained a low-resolution spectrogram (range 410-670
nm; resolution 2000 at H_alpha) of the nova on Mar. 16.792 UT with the
2.0-m NAYUTA telescope (+ MALLS).  The spectrum shows a broad H_alpha
line with a P-Cyg profile and Fe II absorption lines, which suggests
that the variable is indeed a classical nova near maximum light.  A
narrow Na I D absorption feature suggests the existence of a
considerable interstellar reddening.  The FWHM of the H_alpha emission
is 950 km/s, and its absorption minimum is blueshifted by 1150 km/s
from the emission peak (measured by a Gaussian fitting).
      Visual magnitude estimate by K. Hornoch, Lelekovice, Czech
Republic:  Mar. 17.010 UT, 7.9.


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                         (C) Copyright 2007 CBAT
2007 March 17                    (CBET 891)               Daniel W. E. Green