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IAUC 8501: N Sgr 2005; 2005av

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IAUC number 

                                                  Circular No. 8501
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


NOVA SAGITTARII 2005
     Further to IAUC 8500, S. Nakano forwards the following precise
position from K. Kadota (Ageo, Japan, 0.25-m f/5.0 reflector) from
an unfiltered CCD image taken on Mar. 29.737 UT, with the nova at
mag 8.2:  R.A. = 18h16m58s.96, Decl. = -25o56'38".9 (equinox 2000.0).
Nakano also forwards the following position end figures from an
unfiltered image taken by S. Wakuda (Yuto-cho, Hamana-gun, Shizuoka-
ken, Japan, 0.25-m f/5.0 Schmidt-Cassegrain reflector) on Mar.
29.755, with the nova at mag 7.8:  58s.97, 39".1.
     L. Kiss, University of Sydney; and A. Derekas, University of
New South Wales, write that an optical spectrum (0.05 nm/pixel;
range 580-675 nm), taken with the Australian National University
2.3-m telescope (+ Double-Beam Spectrograph) at Siding Spring
Observatory on Mar. 29.81 UT, shows that the new object announced
on IAUC 8500 is indeed a nova.  The prominent H_alpha emission line
shows a strong P-Cyg profile, with the main absorption component
at -1300 km/s; there might also be a weak second component at -2100
km/s.  The FWZI of the H_alpha line exceeds 5000 km/s.  In addition
to H_alpha, a few broad features are visible between 618 and 640 nm,
also with P-Cyg-like profiles.  The Na D doublet is saturated,
indicating high interstellar reddening.
     K. Ayani and Y. Kawabata, Bisei Astronomical Observatory (BAO),
report that their low-dispersion spectra (range 453-680 nm;
resolution 0.6 nm at H_alpha) of this new object (IAUC 8500),
obtained on Mar. 29.8 UT at the BAO 1.01-m telescope, also show it
to be a nova, with H_alpha, H_beta, and Fe II (multiplet 42) lines
having P-Cyg profiles.  Preliminary analysis of the H_alpha
emission (without decomposition of the absorption component) yields
FWHM = 1300 km/s, the minimum of the H_alpha P-Cyg absorption being
blueshifted by 1400 km/s with respect to the emission peak.


SUPERNOVA 2005av IN NGC 6943
     M. Salvo and B. Schmidt, Australian National University (ANU);
L. Kiss, University of Sydney; and A. Derekas, University of New
South Wales, report that a spectrum (range 580-675 nm) of SN 2005av
(cf. IAUC 8499), taken with the ANU 2.3-m telescope (+ Double-Beam
Spectrograph) at Siding Spring Observatory on Mar. 27.76 UT, is
similar to that of the type-IIn supernova 2001ir (cf. IAUC 7784).

                      (C) Copyright 2005 CBAT
2005 March 29                  (8501)            Daniel W. E. Green

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