| Popis: |
The realization that there is a separate subclass of Type I supernovae (SNe) to be denoted as Type Ib came after the detailed study of the SN 1983N in M83 (PANAGIA et al [1]; see also PANAGIA [2], WHEELER and LEVREAULT [3], UOMOTO and KIRSHNER [4]). It was immediately clear that SN 1983N is distinctly different from the classical variety of Type I SNe (obviously denoted as Type Ia SNe) in a number of important aspects. Since then about a dozen SNe have been classified as Type Ib SNe, some newly discovered and others found just re-examining old spectra or paying due attention to the comments that the observers gave at the time when the original observations were made (e.g. BERTOLA [5]). |
