DELLA VALLE, MassimoMassimoDELLA VALLELivio, MarioMarioLivio2022-09-292022-09-2919942041-8205http://hdl.handle.net/20.500.12386/32675An examination of recent observational material reveals substantial differences between supernovae of Type Ia (SNs Ia) in galaxies of different Hubble types. We propose that SNs Ia in late- and early-type galaxies may have different progenitors. A further examination of novae in galaxies of different Hubble types suggests the possibility that SNs Ia in late-type galaxies may be related to cataclysmic variable-type systems, while SNs Ia in early-type galaxies may be related to mechanisms involving an older population. About 50%-70% of the SNs Ia events in spirals observed at the La Silla and Tololo Observatories in the past 4 years appear to be located in the arms of the parent galaxy.STAMPAenArticle10.1086/1872282-s2.0-12044251304https://ui.adsabs.harvard.edu/abs/1994ApJ...423L..31D/abstracthttps://api.elsevier.com/content/abstract/scopus_id/120442513041994ApJ...423L..31DFIS/05 - ASTRONOMIA E ASTROFISICA