SUPERNOVA SN2000b

Supernova 2000b spectra obtained by Francois Colas, Agnès Fienga and Christian Buil with the one-meter telescope of the Pic du Midi observatory. Left, the January 22.8, 2000. Right, the January 25.8, 2000. Rainbow Optics grating (200 line/mm) in the focal reducer for a 24A/pixel dispersion spectrum. Relative flux calibrated with the AOV star HD45105 (VisualSpec software). Note the presence of  the Si II signature at 6200 A (type Ia supernova).

The 22.8/01/2000 spectrum.

The 25.8/01/2000 spectrum

Comparison of the 22.8/01/2000 and 25.8/01/2000 spectra.