[mesa-users] Mass

[Francis Timmes]

if the mass is M and the mass fraction of isotope i is X_i,
then the mass in isotope i is M * X_i.

fxt


> On Nov 20, 2014, at 8:56 AM, kostenko at astro.utoronto.ca wrote:
> 
> Hi, MESA!
> 
> I have a question I hope you can help me with: I'm trying to determine the
> total amount (by mass or by number - doesn't matter) of an isotope
> enclosed between two mass coordinates. I'm a bit confused on how to do
> this, however.
> 
> Initially, I went into the default file for profiles and found that it had
> something called "star_mass_o16" for the isotopes, which it described as
> "information about total mass". I tried plotting it, but got a black
> screen in the pgstar output. Looking more closely, I saw that it was in
> the section called "! the first few lines of the profile contain general
> info about the model.! for completeness, those items are described here.".
> Thus, I am now not even sure that it CAN be plotted.
> 
> In any case, I'd appreciate your help with how to solve the main problem
> which is, again, to determine the total amount of an isotope enclosed
> between two mass coordinates.
> 
> Sasha
> 
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