Photometry of the Supernova SN 2002ap in M 74 during 2002 |
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| Authors: | V T Doroshenko S G Sergeev N I Merkulova E A Sergeeva |
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| Institution: | (1) P. K. Shternberg State Astronomical Institute, Russia;(2) Crimean Branch of the Chilean Isaac Newton Institute, Ukraine;(3) Crimean Astrophysical Observatory, Ukraine |
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| Abstract: | UBVR
c
I
c observations of SN 2002ap during February, October, and November 2002 at the Crimean Astrophysical Observatory are reported. An examination of our photometric data, along with published data, shows that over a period of about a year from the day the SN 2002ap supernova burst, the light curve passed through three developmental stages: a sharp rise, followed by a stage of rapid exponential decrease, and then a slower fading. Based on the shape of the light curve, this supernova is of type SN I, but according to the variation in its color indices, it more likely belongs to the SN Ic supernovae. In the premaximum stage, the energy distribution from  3000  to 6000 resembles the emission from a star of spectral class F5V. In the second stage of the light curve evolution, when the brightness falls off rapidly, the changes in the color indices are associated with a change in the radiation temperature indicative of rapid cooling of the ejected material. Taking the effective radiation temperature in the premaximum stage to be T
eff  6500 K, we estimate the expansion velocity of the quasiphotosphere to be about 9700 km/s. |
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| Keywords: | stars Supernovae stars photometry individual SN 2002 ap |
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