General Question

rebbel's avatar

A star, that will go supernova, apparently, can become a black hole, or a neutron star; how does that work?

Asked by rebbel (31346points) January 1st, 2019

I heard this recently in a video that was about the Orion constellation (probably the aforementioned star is located there; could it be Betelgeues, or Rigel, or Bellatrix?).
What can make it so the outcome can be either a black hole, or a neutron star?

If you answer, can you pretend I’m your aunt, or your grandfather; in other words, explain it in clear and simple terms?

Thanks in advance!

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7 Answers

ragingloli's avatar

I think it is a matter of mass.
When a supermassive star dies, the fusion reaction becomes too weak to sustain the star’s size, so the star collapses in on itself, like a balloon that is deflating.
At the end of that collapse, it increases the pressure in the core, causing a secondary fusion event, which both causes the outer material to be explosively expelled, which is the supernova, and the core to be further compressed into either a core made almost entirely of neutrons, or, if the collapse and resulting explosion was strong enough, into a black hole.
But since you want me to pretend that you are my grandfather:
What do you care, gramps, you will be dead soon!

Caravanfan's avatar

@ragingloli is correct. The magic number is called the Chandrasekhar Limit. Anything under that limit becomes a stable white dwarf (like our sun). Anything over that limit will theoretically collapse to a black hole or neutron star.
https://www.britannica.com/science/Chandrasekhar-limit

Dutchess_lll's avatar

Yeah. What they said. For once the size counts.

Caravanfan's avatar

Actually, in reading my answer it implies that our sun is a stable white dwarf. It is, of course, not a white dwarf—it is a yellow main sequence star. But after the star goes nova (it will not go supernova as it’s too small) it will collapse to a white dwarf and then ultimately burn out. It will not become a black hole because it is not massive enough.

Dutchess_lll's avatar

Like I said, size matters.

I think I have the extra resources to take another college astronomy class. I think I will do that.

Dutchess_lll's avatar

@Caravanfan our sun will be a stable white dwarf. Like our president is.

rebbel's avatar

Thanks, guys, for your insight, and the interesting reading material.

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