Photometric observations of the bright Type II supernova 1980K in NGC 6946

Astronomy and Astrophysics – Astronomy

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Light Curve, Stellar Spectra, Stellar Spectrophotometry, Supernovae, Ubv Spectra, Electrophotometry, Stellar Color

Scientific paper

Photoelectric UBV photometry of the recent bright supernova 1980k in NGC 6946 is presented. The U, B, and V light curves show a linear decay in magnitude at the rates 0.m100, 0.m058 and 0.m041 day-1, respectively, over the first 57 days past maximum, consistent with the L class of Type II supernovae. The distance modulus of NGC 6946 determined from ten different photometric and geometric distance indicators is μ0 = 28.7 ± 0.3. The apparent magnitude at maximum, B(max) = 11.7 ± 0.1 and B0(max) = 10.2 ± 0.2 corrected for the large and uncertain extinction, indicates that SN 1980k reached an absolute magnitude MB0 (max) = 18.5 ± 0.35.

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