Two possible progenitors of type I supernovae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stellar Evolution, Stellar Spectra, Supernovae, White Dwarf Stars, Main Sequence Stars, Planetary Nebulae, Stellar Envelopes

Scientific paper

The observations indicate that two classes of stars explode as type I supernovae: (a) old (10-billion yr) white dwarfs belonging to low-mass binaries; and (b) relatively young (less than one-billion yr), massive (3-6 solar masses) stars. Since the two SN I species have identical spectroscopic and photometric properties, the corresponding evolved stars presumably have identical exploding cores. That can happen only if the core mass of fairly massive evolved stars is just slightly above the Chandrasekhar limit.

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