Supernovae 2006cb, 2006co, and 2006cq

Abstract

R. J. Foley, J. S. Bloom, D. Kocevski, D. Perley, and A. V. Filippenko, University of California, Berkeley, report that inspection of CCD spectra (range 350-930 nm), obtained on May 30 UT with the Keck I 10-m telescope (+ LRIS), shows that SN 2006cb (cf. IAUC 8709) is of type Ib, approximately 4-6 weeks after maximum light; absorption lines of He I are prominent. The spectrum of 2006co (cf. CBET 523) shows it to be a young type-II supernova, having a blue continuum with hydrogen Balmer lines superposed. Removing the recession velocity of 4030 km/s, derived from H-II- region emission lines, we find the minimum of the H-beta absorption to be blueshifted by 12300 km/s. Spectrograms obtained on May 31 shows that SN 2006cq (cf. CBET 527) is of type Ia, with a spectral-feature age (Riess et al. 1997, A.J. 114, 722) of -1.7 +/- 2 days relative to maximum brightness; adopting the recession velocity of 14500 km/s (Rines et al. 2003, A.J. 126, 2152), the minimum of the Si II 635.5-nm line is found to be blueshifted by 10700 km/s.

Publication
Central Bureau Electronic Telegrams