2004IAUC.8378....1P

F. Patat, European Southern Observatory; S. Benetti and A. Pastorello, Istituto Nazionale di Astrofisica; and A. V. Filippenko, University of California, Berkeley, on behalf of the ERTN (see IAUC 8341), report that a fully reduced spectrum (range 320-900 nm; resolution 1.2 nm) of SN 2004dj (cf. IAUC 8377), obtained on Aug. 3.17 UT by J. Aceituno at the Calar Alto Observatory 2.2-m telescope (+ CAFOS), shows it to be a normal type-II-P supernova, very similar to SN 1999em, about 3 weeks after explosion (Leonard et al. 2001, Ap.J. 553, 861; Hamuy et al. 2001, Ap.J. 558, 615). Besides a very-well-developed hydrogen Balmer series, lines from Na I, Fe II, and Ca II are clearly visible, all with P-Cyg profiles. The Na I D feature is possibly blended with He I 587.6-nm. The spectrum also shows an unresolved absorption at 589.7 nm, identified as interstellar Na I D, most likely generated by intervening material in the host galaxy. The equivalent width of this feature, 0.11 nm, corresponds to E(B-V) about 0.18 mag. The photospheric expansion velocities, deduced from the minima of absorption troughs of various lines, are as follows: H_alpha, 6700 km/s; H_beta, 5500; Fe II 516.9-nm, 4150; Fe II 501.8-nm, 3800; Fe II 492.4-nm, 3850 km/s.