Photometric observations of the supernovae in NGC 7723, NGC 1325 and NGC 4402

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Supernovae, Ubv Spectra, Colorimetry, Electrophotometers, Light Curve, Stellar Luminosity, Supernova Remnants

Scientific paper

Photoelectric observations in UBV are reported for the recent extragalactic supernovae in NGC 7723, 1325, and 4402. The supernova in NGC 1325 was peculiar in that it faded rapidly and consequently was probably of Type II, while the remaining two were apparently of Type I. These observations are compared with the mean light and color curves for supernovae, and an improved mean (U-B) color curve for Type I supernovae is given.

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