[Mesa-users] Question about mass fraction

[RICHARD H D TOWNSEND]

Hi Anne --

That's right -- at a given location of the star, if we take a small (local) sample of stellar material, it's the ratio of mass of He in the sample to the total mass of the sample.

cheers,

Rich

> On May 15, 2019, at 6:32 PM, d10631026陳瑜安 <d10631026 at gapps.fg.tp.edu.tw> wrote:
> 
> Dear MESA Users,
> 
> I'm not sure whether the meaning of mass fraction is like what I draw in the picture.
> I would like to ask about the meaning of mass fraction.
> 
> Thank you,
> Ann
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