Light curves of type II supernovae. 2: The analysis

Details Light curves of type II supernovae. 2: The analysis Light curves of type II supernovae. 2: The analysis

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..731p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 731-741

Astronomy and Astrophysics

Astrophysics

110

Astronomical Photometry, Astronomical Spectroscopy, Light Curve, Stellar Color, Stellar Spectra, Supernovae, Cobalt Isotopes, Multivariate Statistical Analysis, Nickel Isotopes, Radioactive Decay, Spectroscopic Analysis

Scientific paper

All photometric observations of Type II Supernovae published to date, and collected in Paper 1, have been reanalyzed along with data from SN spectroscopy. The light curves are very different both as saturation and slopes of the different portions. For sake of simplicity, the average decline rates have been used to describe the gross characteristics of the light curves. It is shown that this sample, numeric parameter well discriminates among the Plateau and Linear shapes. Aslo the color curves are very different, with the Linears on average bluer than Plateaus. By comparing the light curves in absolute magnitude we confirm that at maximum there is a large dispersion in the absolute magnitude. On the hypothesis that the late light curve is powered by the radioactive decay of Co-56, from the observed dispersion of Mv at 300 days we conclude that the amount of Ni-56 synthesized in the explosion of SNII must be in the range 0.04-0.10 solar mass. With the aim to determine how many parameters are needed to characterize the properties of SNII, we performed a Multivariate Factor Analysis on a number of observables, including also some spectroscopic parameters.

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