2005IAUC.8522....2M

M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian Center for Astrophysics, report that a spectrum (range 340-730 nm) of SN 2005bv (cf. IAUC 8520), obtained on May 2.32 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ia supernova, with a spectral-feature age (cf. Riess et al. 1997, A.J. 114, 722) of about 15 (± 2) days after maximum light. The supernova expansion velocity, derived from the minimum of Si II (rest 635.5 nm) and adopting the recession velocity of 10 689 km/s for the host galaxy as measured from H_alpha emission of an H II region in the host galaxy, is about 10400 km/s. A spectrogram of SN 2005bf (cf. IAUC 8507), obtained by Berlind on May 2.15, shows it to be a type-Ib supernova, confirming reports by Wang and Baade (IAUC 8521). The spectrum has developed conspicuous lines of He I (rest 447.1, 587.6, 667.8, 706.5 nm) and is very similar to spectra of SN 1984L (Harkness et al. 1987, Ap.J. 317, 355), about 2 weeks after maximum. SN 2005bf was previously classified (IAUC 8509) as a type-Ic supernova.