2011CBET.2785....2K

K. S. Kawabata, Hiroshima University; H. Minamoto, Fukuyama Senior High School; and M. Yamanaka, Hiroshima University, obtained low-resolution optical spectra of PSN J02254889+1832000 = SN 2011ek (cf. CBET 2783) and of PSN J13271319+5529174 = SN 2011em on Aug. 6.8 and 6.5 UT, respectively, with the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory. Both spectra show broad absorption features of Si II 597.2- and 615.5-nm lines and the 'W'- shaped S II 546.8= and 564.0-nm lines. The silicon lines show blueshifts of -11500 and -15000 km/s for 2011em and 2011ek, respectively. The shallow Si II 597.2-nm and Ca II infrared-triplet absorptions in 2011em suggest that it is a type-Ia supernova, a few days before or around maximum brightness. The strong Si II 597.2-nm, O I 777.3-nm, and Ca II infrared-triplet absorptions in 2011ek suggest that this is a supernova-1991bg-like, faint type-Ia supernova before maximum brightness.