Photometric and Spectroscopic Properties of Type II-P Supernovae
  We study a sample of 23 Type II Plateau supernovae (SNe II-P), all observed
with the same set of instruments. Analysis of their photometric evolution
confirms that their typical plateau duration is 100 days with little scatter,
showing a tendency to get shorter for more energetic SNe. The rise time from
explosion to plateau does not seem to correlate with luminosity. We analyze
their spectra, measuring typical ejecta velocities, and confirm that they
follow a well behaved power-law decline. We find indications of high-velocity
material in the spectra of six of our SNe. We test different dust extinction
correction methods by asking the following -- does the uniformity of the sample
increase after the application of a given method? A reasonably behaved
underlying distribution should become tighter after correction. No method we
tested made a significant improvement.
