Photometric and spectroscopic properties of Type II-P supernovae

We study a sample of 23 Type II Plateau supernovae (SNe II-P), all observed\nwith the same set of instruments. Analysis of their photometric evolution\nconfirms that their typical plateau duration is 100 days with little scatter,\nshowing a tendency to get shorter for more energetic SNe. The rise time from\nexplosion to plateau does not seem to correlate with luminosity. We analyze\ntheir spectra, measuring typical ejecta velocities, and confirm that they\nfollow a well behaved power-law decline. We find indications of high-velocity\nmaterial in the spectra of six of our SNe. We test different dust extinction\ncorrection methods by asking the following -- does the uniformity of the sample\nincrease after the application of a given method? A reasonably behaved\nunderlying distribution should become tighter after correction. No method we\ntested made a significant improvement.\n