[Yosemitest]

My thought were that

if Comet Ison actually struck the body of the Sun, that the mass of Ison would probably be totally melted and blown out away from the body of the Sun.

But what if I'm wrong ?
But I'm not an Astrophysics Scientist.
Watch Why Does Iron Kills Stars .
Is this not a possibility, although it may not be very probable ?

[jpsb]

Going from memory, iron per say is not a star killer and my guess is that you would be correct in thinking that any small iron body approaching the sun would be vaporized and blown out into space. Anyway back to iron. Once a star begins fusing iron it begins to lose energy and collapses. So it is not the presence of iron that is the problem, it is the process of creating iron that robs the star of energy. Not the iron itself. Hope that helps.

[Windflier]

Watch Why Does Iron Kills Stars . Is this not a possibility, although it may not be very probable ?

It's true that iron kills stars, but it's not by way of infection from small bodies falling into them.

A star has to create iron at its core for it to die. Stars only do this at the end of their lives. During that process, they create most of the heavier elements, including iron, which is the one element that destroys the fusion process and instantly causes the star to go nova.