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NGC 6284 13.3 Billion Years Old
Posted: Tue Nov 07, 2023 6:24 pm
by Graeme1858
A new study has found Globular Cluster
NGC 6284 to be 13.3 billion years old!
https://phys.org/news/2023-11-globular- ... omers.html
Graeme
Re: NGC 6284 13.3 Billion Years Old
Posted: Tue Nov 07, 2023 7:12 pm
by helicon
That's amazingly old! Must have really low metallicity....
Re: NGC 6284 13.3 Billion Years Old
Posted: Tue Nov 07, 2023 8:26 pm
by Graeme1858
helicon wrote: ↑Tue Nov 07, 2023 7:12 pm
That's amazingly old! Must have really low metallicity....
The article says:
The metallicity of this cluster was found to be at a level of -1.36
Which I don't really understand because I was taught that the level of metallicity is calculated from and shown as a mass fraction: Hydrogen + Helium + Metals = 1
Maybe it's so old the stars are Population 3 and the maths is different?
Anyone know what a metallicity level of -1.36 means?
Graeme
Re: NGC 6284 13.3 Billion Years Old
Posted: Tue Nov 07, 2023 11:53 pm
by messier 111