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Hi Andrew
Thanks for that. According to my old notes we had CNO Fusion as the dominant process in Main Sequence stars >8 Solar Masses, and the elements heavier than Iron produced by Type II SN. I was quite surprised at how small a white dwarf was considering the amount of matter crammed into it can be up to 1.5 Solar Masses.
One thing that still puzzles me is how to determine whether a Type II SN will become a Black Hole (like the Type I 30-40 solar masses) or a Neutron Star. This is one thing I never fully understood.
I know a lot can happen in a decade, so appreciate your explanations.
Pete
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