Heavy elements from red giants

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In summary: Best RegardsRobin AnderssonI can't think of any way that a 4 solar mass star can go boom without a binary companion. My tenative answer to that question would be no, although someone might correct me with some astrophysical process that I haven't thought... through.Best Regards
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  • #2
Yup, and you can tell where the element came from by the isotope signal.

s (slow)-process elements come from red giants
r (rapid)-process elements come from supernova (probably)

http://en.wikipedia.org/wiki/S-process
http://en.wikipedia.org/wiki/R-process

And then there are the rare P and rP processes

One reason that much of the heavy elements *don't* come from supernova is that much of the supernova stays with the star. Most of the iron that gets formed by supernova ends up falling back into the neutron star (and we can tell that because supernova produced iron has a special composition that is rich in some iron-isotopes that are relatively rare on earth).
 
  • #3
twofish-quant said:
Yup, and you can tell where the element came from by the isotope signal.

s (slow)-process elements come from red giants
r (rapid)-process elements come from supernova (probably)

http://en.wikipedia.org/wiki/S-process
http://en.wikipedia.org/wiki/R-process

And then there are the rare P and rP processes

One reason that much of the heavy elements *don't* come from supernova is that much of the supernova stays with the star. Most of the iron that gets formed by supernova ends up falling back into the neutron star (and we can tell that because supernova produced iron has a special composition that is rich in some iron-isotopes that are relatively rare on earth).

Is there any numbers of how much % of the mass of a star that is iron atoms? I mean for such stars that actually to manage to reach to fuse everything needed to make up iron.

By now I got a bit skeptic on my own knowledge. Do all stars who die from supernova fuse iron? Also did any star who reached fusion of any atom less massive than iron survived (I know they they die anyway) the supernova event?

Best Regards
Robin Andersson
 
  • #4
RobinSky said:
Is there any numbers of how much % of the mass of a star that is iron atoms? I mean for such stars that actually to manage to reach to fuse everything needed to make up iron.

By now I got a bit skeptic on my own knowledge. Do all stars who die from supernova fuse iron? Also did any star who reached fusion of any atom less massive than iron survived (I know they they die anyway) the supernova event?

Best Regards
Robin Andersson

White dwarf stars can accrue mass from a companion and then go supernova. They don't fuse iron, but instead the whole stars burns up in a runaway thermonuclear explosion by fusing carbon. Or were you only asking about massive stars that go supernova on their own?
 
  • #5
RobinSky said:
Is there any numbers of how much % of the mass of a star that is iron atoms? I mean for such stars that actually to manage to reach to fuse everything needed to make up iron.

A typical supernova has 20 solar masses, and the thing goes boom when the core gets to 1.4 solar mass.

Do all stars who die from supernova fuse iron?

Well... Supernova Ia's happen a different way than type II's. They are C/O white dwarfs that get stuff dumped on to them. Now while the Ia is blowing itself apart it produces lots of iron, but because it happens so fast there's not really time to produce much stuff heavier than iron.

http://www.jinaweb.org/events/frontiers07/talks/ivo_seitenzahl.pdf

Also did any star who reached fusion of any atom less massive than iron survived (I know they they die anyway) the supernova event?

Not sure what you are asking here.
 
  • #6
twofish-quant said:
Not sure what you are asking here.

Sorry. Let's say we have this star of 4 solar masses, he(the star)is in his last dying year. What I know, not all massive stars, are massive enough to reach the temperatures to fuse atoms to create Iron. So before iron got created in the star, there was probably another heavy element. So, is it possible for stars (except white dwarfs and binaries) to go boom without any iron in its presence?
Hope that was a bit clearer, if not I apologise.

Best Regards
Robin Andersson
 
  • #7
RobinSky said:
Sorry. Let's say we have this star of 4 solar masses, he(the star)is in his last dying year. What I know, not all massive stars, are massive enough to reach the temperatures to fuse atoms to create Iron. So before iron got created in the star, there was probably another heavy element. So, is it possible for stars (except white dwarfs and binaries) to go boom without any iron in its presence?

I can't think of any way that a 4 solar mass star can go boom without a binary companion. My tenative answer to that question would be no, although someone might correct me with some astrophysical process that I haven't thought of.
 
  • #8
Then if true, maybe the answer is no - all stars who go boom on their own had the presence of iron in its mass. (This is another way to ask my question - but more as a statement).


I think I have to become better at explaining!
 
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What are heavy elements from red giants?

Heavy elements from red giants are elements that are produced during the later stages of a red giant star's life cycle. These elements are created through nuclear fusion reactions within the star's core and are released into the surrounding space when the star eventually dies and explodes as a supernova.

What is the process of creating heavy elements in red giants?

The process of creating heavy elements in red giants is through nuclear fusion reactions that occur within the star's core. As the star's core runs out of hydrogen, it begins fusing helium atoms together to form carbon, oxygen, and other heavier elements. This process continues until the core runs out of fuel and the star dies.

Why are heavy elements from red giants important?

Heavy elements from red giants are important because they are essential building blocks for the universe. These elements make up the planets, stars, and galaxies that we see today. Without them, life as we know it would not exist.

How do we study heavy elements from red giants?

We study heavy elements from red giants through various methods, including spectroscopy and astronomical observations. Scientists also use computer simulations to model the processes that occur within red giants and predict the elements that are formed.

What impact do heavy elements from red giants have on our understanding of the universe?

Heavy elements from red giants have a significant impact on our understanding of the universe. They provide insights into the evolution of stars and the processes that occur within them. They also help us understand the origins of elements and the formation of galaxies, giving us a better understanding of the universe's overall structure and history.

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