2002IAUC.8019....3B

S. Benetti, G. Altavilla, A. Pastorello, M. Riello, M. Turatto, and L. Zampieri, Osservatorio Astronomico di Padova; and E. Cappellaro, Osservatorio Astronomico di Capodimonte, on behalf of the ERTN (cf. IAUC 7987), report that a fully reduced CCD spectrum (range 333-1000 nm, resolution 1.2 nm) of SN 2002hy (cf. IAUC 8016), obtained on Nov. 15.33 UT with the European Southern Observatory 3.6-m telescope (+ EFOSC2), shows it to be a peculiar type-Ib supernova caught soon after explosion. The spectrum is dominated by a blue continuum [T_bb about 11500 K, once dereddened by E(B-V) about 0.17, as calculated from the equivalent width of the Na I D interstellar band] with overimposed He I lines (at 388.9, 447.1, 501.5, 587.5, 667.8, and 706.5 nm) and their P-Cyg profiles. From the He I 587.5-nm minimum, an expansion velocity of about 9500 km/s is derived. The peaks of the He I emission lines are blueshifted by about 1800 km/s. Narrow absorptions identified with H-alpha and H-beta are detected at 629.1 and 468.6 nm, respectively, from which an expansion velocity of about 16000 km/s is deduced for H-alpha.