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2011CBET.2791....1K - Central Bureau Electronic Telegrams, 2791, 1 (2011/August-0)
Supernova 2011fd near NGC 2273B = PSN J06463985+6021028.
KOFF R.A., MAGILL L., KOTAK R., PASTORELLO A., OCHNER P. and LYKKE J.
Abstract (from CDS):
L. Magill, Queen's University, Belfast, and Isaac Newton Group; R. Kotak, Queen's University, Belfast; A. Pastorello, Osservatorio Astronomico di Padova, Instituto Nazionale di Astrofisica (INAF), Universita di Padova; and P. Ochner, Osservatorio Astronomico di Padova, INAF – on behalf of a larger collaboration – report that an optical spectrum (range 385-900 nm) of PSN J06463985+6021028 = SN 2011fd was obtained at the Nordic Optical Telescope (+ ALFOSC spectrograph) by J. Lykke on Aug. 20.2 UT. The spectrum shows broad P-Cyg Balmer lines superimposed on a relatively blue continuum, suggestive of a young type-II-plateau supernova. The H_alpha profile is dominated by a broad emission component, the absorption trough being barely perceptible. The H_beta and H_gamma profiles, on the other hand, display classical P-Cyg- type profiles; the average expansion velocity, as estimated from the blue edge of the absorption troughs of these lines, is about 10000 km/s, after correcting for the recession velocity of NGC 2273B (2101 km/s; from de Vaucouleurs et al. 1991, Third Ref. Cat. of Bright Galaxies, Ver. 3.9; via NED website). A broad feature, likely due to He I 587.6-nm, is also apparent in the spectrum. Weak lines of Fe II (multiplet 42) are also detected. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) confirms a type-IIP identification, with SNe 2004et (Sahu et al. 2006, MNRAS 372, 1315) and 1999em (Baron et al. 2000, Ap.J. 545, 444), providing good matches for epochs ranging from a few days pre-peak to about one week post-peak.
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