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Circular No. 8404 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) 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. NOVAE IN M31 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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