brown dwarfs that are metal poor found

[notFritzArgelander]

https://phys.org/news/2020-07-bizarre-b ... tists.html

[Graeme1858]

Would you not expect a 10 billion year old star, formed when there was far less metallicity, to be low in iron?

Regards

Graeme

[notFritzArgelander]

Would you not expect a 10 billion year old star, formed when there was far less metallicity, to be low in iron?

Regards

Graeme

Yes. Iron abundance correlates very well with age.

[Buckethead 2.0]

Hmmm, stars gain iron and humans lose iron as they age.

[notFritzArgelander]

Hmmm, stars gain iron and humans lose iron as they age.

Well...... older stars have less iron since when they are born there is less iron in the universe. The only stars that gain iron as they age are more massive objects that go through a supernova. The Sun, for instance, isn't massive enough to ever make iron.

[Buckethead 2.0]

Hmmm, stars gain iron and humans lose iron as they age.

Well...... older stars have less iron since when they are born there is less iron in the universe. The only stars that gain iron as they age are more massive objects that go through a supernova. The Sun, for instance, isn't massive enough to ever make iron.

Oh yes, I remember now from last time we discussed this. I'm learning friend, however slow it may be.

[helicon]

I assume that the iron formed in the core of massive stars is distributed throughout the universe via supernovae. Hence, for iron to be in abundance in the solar system then there would have to have been relatively nearby SN's prior to the sun's formation. I suppose that span of time would have been about 10 billion years.