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SN2000ck


SN 2000ck in IC 4355. D.o.lo.res R frame of 30 seconds exposure time; North is up, east on the right; seeing ~1". The extimated magnitude is R~18.2 We classified the SN with the FIRST spectrum taken with D.o.lo.res.

Here is the text of the IAU Circular No. 7434 relative to the SN 2000ck spectroscopic classification:

"S. Benetti, R. Cosentino, J. Licandro, F. Paulli, M. Pedani, G. Trancho, A. Zacchei, and E. Giro, Telescopio Nazionale Galileo (TNG); P. Conconi, G. Crimi, and E. Molinari, Osservatorio Astronomico di Brera; and A. Caproni, M. Comari, C. Corte, S. Monai, and M. Pucillo, Osservatorio Astronomico di Trieste, report: "A fully reduced CCD spectrum (range 333.3-722.3 nm, resolution 1 nm), obtained on May 31.03 UT with the TNG reflector (+ D.o.lo.res spectrograph), tentatively shows SN 2000ck (cf. IAUC 7431) to be a type-II supernova near maximum light. The spectrum is dominated by a very blue continuum (T_bb about 17 000 K), upon which we identify (even if faint) H-delta, H-gamma, and H-beta lines with relatively narrow P-Cyg profiles (from which we derive an expansion velocity of about 6200 km/s). There is no sign of a broad H-alpha feature. From weak interstellar lines due to the Na I D absorption feature (EW about 0.12 nm) seen at about 605.3 nm, we derive a parent-galaxy recession velocity of about 8150 km/s."