Late Time Photometric Behavior of Supernova
In a previous paper BARBON et al.  have shown, from the analysis of the light curves of few well studied supernovae (SNe), that the blue luminosities of SNe in the range 200–400 days after maximum light fade linearly with a decline rate which seems a characteristic for each SN type. The average decline rates in the blue band were found γsni = 1.52, and γSNII = 0.81 [mag/100d]. Due to the scanty material available no distinction was made for the different subtypes of SNe, neither was possible to analyze the behaviour in different photometric bands. To improve that work, we started a program of photometric observations of SNe at late stages, using the ESO telescopes at La Silla (DELLA VALLE et al. ). In the first run, we observed a sample of ten SNe, i.e. 1985P, 1986G, 1986E, 1986I, 1986L, 1986N, 1986O,1987D, 1987F, 1987K, that, at the time of observations, were at phase ranging from six months to two years. A full account of the observations and of the reduction technique will be presented elsewhere (TURATTO et al. ), while the detailed photometric and spectroscopic study of three SNe of the sample (SN 1986E, SN1987D and SN 1987F) has been given in a previous paper (CAPPELLARO et al. ).
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