[] Type Ia SN 2011B : spectral evolution


We have performed the spectroscopic observations of Type Ia SN 2011B since Jan 8. This object is classified into normal Type Ia SNe. We find the high-velocity features of CaII IR triplet absorptions at Jan. 8, which is 13.5 days before B-band maximum. On the other hand, the SiII6355 absorption line is much lower velocity than that of CaII. This results indicate that the CaII regions is much detached from the photosphere. The presence of high-velocity regions might come from rather delayed detonations than deflagration. We will continue the observations of SN 2011B.