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$\begingroup$ Our sun is not massive enough for there. It will fuse hydrogen. At a later stage it can fuse helium. After that fusion will stop in our sun. The processes you mention can happen in other -more massive suns-, but not in our sun and not at the moment. And as such do not explain why they are currently present. Both existing answers already refer to nova and other more massive suns, and they their earlier existance has contributed to the presence of heavier material in our sun. $\endgroup$
– Hennes
Commented Mar 21, 2021 at 19:56
3

$\begingroup$ The Sun will never make iron. $\endgroup$
– ProfRob
Commented Mar 21, 2021 at 22:37
$\begingroup$ Nor will it ever explode as a supernova. Once nucleosynthesis finishes, it will collapse into an extremely dense, white-hot stellar remnant, and all the gold it currently contains (which is more than all the water in Earth's oceans) will remain trapped there forever. $\endgroup$
– Chappo Hasn't Forgotten
Commented Mar 23, 2021 at 0:19

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