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IAUC 8404: 2004dk, 2004dw, 2004dy,, 2004eg; NOVAE IN M31

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                                                  Circular No. 8404
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2004dk, 2004dw, 2004dy, AND 2004eg
     A. V. Filippenko, M. Ganeshalingam, F. J. D. Serduke, and J. L.
Hoffman, University of California, Berkeley, report that inspection
of CCD spectra (range 330-1000 nm), obtained on Sept. 10 UT with
the Shane 3-m reflector at Lick Observatory, reveals that SN 2004dw
(IAUC 8392) is of type II, perhaps 2 months past maximum brightness.
The H_alpha P-Cyg profile is greatly dominated by the emission
component, while the other hydrogen Balmer lines have typical P-Cyg
profiles.  SN 2004eg (IAUC 8401) is also of type II, but the
velocity of the ejecta is extremely low, roughly 500 km/s, as
measured from the absorption minima of the P-Cyg profiles.  SN
2004dy (IAUC 8395) is a supernova, probably of type II, but the
spectrum is rather noisy; relatively broad H_alpha emission seems
to be present.  SN 2004dk (IAUC 8377) was previously classified by
Patat et al. (IAUC 8379) as a type-Ic supernova, but in the Lick
spectrum, prominent He I lines have appeared, typical of type-Ib
supernovae about 1 month past maximum brightness; indeed, the Lick
series of three spectra obtained over the past few weeks shows an
evolution more consistent with that of Ib than Ic supernovae.

     K. Hornoch, Lelekovice, Czech Republic, reports the discovery
of two apparent novae in M31 by P. Kusnirak (first object), M. Wolf
(second object), and himself (both objects) on CCD R-band images
taken by them and L. Sarounova with the 0.65-m reflector at
Ondrejov.  The first new object is located at R.A. = 0h43m26s.84,
Decl. = +41o16'40".8 (equinox 2000.0), which is 479" west and 32"
north of the center of M31.  R-band magnitudes for this object from
Hornoch:  Aug. 2.974 UT, [20.5; 3.960, 19.2:; 4.901, 18.8; 6.997,
17.8; 7.982, 17.3; 9.070, 17.8; 10.005, 18.3; 10.956, 17.7; 12.057,
18.3; 15.943, 17.6; 23.902, 17.5; 24.060, 17.6; 28.899, 18.1;
31.915, 18.6; Sept. 3.018, 18.6; 3.868, 18.7; 4.819, 19.0; 5.058,
18.9; 6.930, 19.0; 8.929, 18.3; 9.893, 18.3; on Aug. 24.063, V =
17.6.  The second new object is located at R.A. = 0h42m40s.25, Decl.
= +41o14'42".9, which is 46" west and 86" south of the center of
M31; R-band magnitudes for this object from Hornoch:  Aug. 24.060,
[19.8; 28.899, [19.1; 31.915, 18.3; 31.938, 18.0; 31.952, 17.8;
Sept. 3.018, 17.5; 3.868, 17.6; 4.841, 18.2; 5.862, 18.1; 6.930,
18.0; 8.953, 18.1; 9.893, 18.4.  Filippenko et al. add that
inspection of spectra, obtained at Lick (as described above) on
Sept. 10, shows both objects to be novae with very strong H_alpha
emission (FWHM about 2000 km/s); considerably weaker H_beta and Fe
II may be visible, as well.

                      (C) Copyright 2004 CBAT
2004 September 11              (8404)            Daniel W. E. Green

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