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Type 1a supernova (emits singly Ionised Silicon Si II)


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Hi

in the context of a type1a suprnova, which is how they are identified by strong ionised silicon spectra lines, i.e. SI II  is absorbing 635.5 nm.

Can anyone tell me how singly ionised silicon is generated?

is a result of fusion between carbon  & oxygen?

and if so why those two elements? in a type 1a supernova

Thanks

Steve

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Thanks

Am I correct in thinking this ionised silicon is produced from the oxygen burning process in vast quantities and is a prominent gas when the star explodes, hence the absorption lines?

Also if a type 1a supernova is being fed from a red giant partner, hydrogen, why is their no hydrogen gas in the explosion and hence hydrogen absorption line?

(Type 1a are apparently identified by no hydrogen or helium absorption lines, mainly ionised silicon.)

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