NGC 6284 13.3 Billion Years Old

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Graeme1858 Great Britain
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NGC 6284 13.3 Billion Years Old

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Post 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


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Re: NGC 6284 13.3 Billion Years Old

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Post by helicon »

That's amazingly old! Must have really low metallicity....
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Re: NGC 6284 13.3 Billion Years Old

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Post 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?

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messier 111 Canada
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Re: NGC 6284 13.3 Billion Years Old

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Post by messier 111 »

I don't know if this can be useful ,
https://en.wikipedia.org/wiki/Metallicity
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