1956/08/01 by W. Baade, G. R. Burbidge, F. Hoyle +3 · 1 citation
Physics and Astronomy · #Gamma-ray bursts and supernovae
paper · pdf · doi:10.1086/126941
openalex publication_date 1956/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Baade and Minkowski have shown that on the basis of the observed light curves and spectra we have to distinguish two kinds of supernovae. Most remarkable are the light curves of the supernovae of type I. About 100 days after the maximum the decrease in brightness becomes linear with a gradient of 0.0137 magnitude per day.1 This linear decrease with the gradient given above applies both to the observed photographic and visual light curves. An example of the former is the light curve of the supernova in IC4182 which could be followed by Baade until it reached the 20th magnitude (Fig. 1). Examples of visual light curves of