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IAUC 8544: V1663 Aql = Poss. N IN Aql; 2005cl

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IAUC number

                                                  Circular No. 8544
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)

     M. Dennefeld and F. Ricquebourg, Institut d'Astrophysique de
Paris; and Y. Damerdji, Observatoire de Haute-Provence (OHP),
write that they obtained a calibrated spectrum (range 465-830 nm,
resolution 0.6 nm) on June 11.1 UT of the possible nova reported on
IAUC 8540, using the 1.93-m telescope (+ Carelec spectrograph) at
OHP.  The spectrum shows a very red continuum but no sign of
molecular absorption bands, so reddening appears to be present;
there are, however, various metallic stellar absorption features
present, compatible with an early K-type star, so this may be a
symbiotic nova (though the term 'peculiar nova' is perhaps more
appropriate).  There are also strong emission lines with narrow
P-Cyg profiles at H_alpha and O I (777 nm); the expansion
velocities from these lines are 700 km/s in both cases (suggestive
of a slow nova).  Faint H_beta and numerous faint Fe II lines, all
with P-Cyg profiles, are also seen in the range 480-640 nm.  Due to
the peculiar nature of this nova, continuous photometric and
spectroscopic observations are encouraged.
     N. N. Samus and E. Kazarovets, Institute of Astronomy, Russian
Academy of Sciences, inform us that the designation V1663 Aql has
been given to this nova (cf. IAUC 8540).

SUPERNOVA 2005cl IN MCG -01-53-20
     Further to IAUC 8542, H. Pugh and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images taken
on June 12.48 (at mag 18.3) and 14.45 UT (mag 18.2).  An image
taken on June 2.47 also showed a marginal detection of the new
object (limiting mag about 18.8).  SN 2005cl is located at R.A. =
21h02m02s.35, Decl. = -6o17'35".7 (equinox 2000.0), which is 18".0
west and 13".3 north of the nucleus of MCG -01-53-20.  KAIT images
taken on May 12.50 (limiting mag about 19.5) and 23.49 (limiting
mag about 19.0) showed nothing at this position.
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 350-740 nm)
of SN 2005cl, obtained on June 13.43 UT by P. Berlind with the F.
L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a
type-IIn supernova.  The spectrum consists of a blue continuum,
indicating young age, and Balmer emission lines with a narrow
H_alpha component of about 500 km/s (FWHM) superposed on a weaker
and broader component of about 4000 km/s (FWHM).

                      (C) Copyright 2005 CBAT
2005 June 14                   (8544)            Daniel W. E. Green

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