[mesa-users] Question about abundances in the 1 Msun test problem

[Aaron Dotter]

Hi Bill,

At some point it will make more sense to say "just use
set_uniform_xa_from_file" rather than adding more options.  I use that one
all the time and am a very happy customer.

Aaron


On Thu, Aug 7, 2014 at 1:00 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

>
> On Aug 6, 2014, at 7:42 PM, Francis Timmes wrote:
>
> how about a third option, “dump into the most abundant isotope”?
> for this particular case, a touch more h1 may be the least perturbing
> solution.
>
>
> Hi Frank,
>
> yes, i know i did something other than what you recommended. ;D
> the reason is that it was easy to do what i did, and it is a bit harder to
> do
> what you suggested given the current way the code is structured.
> it currently gets the X and Y info from the user and then picks
> a set of metal mass fractions from a given set to provide the
> remaining Z.  So transferring from Z to X or Y isn't currently
> an easy to implement option whereas changing the choice
> of metals is.    so i did the easy one first.
>
> i can see it now --- after adding a 3rd option to add to the most
> abundant, we'll need a 4th option that lets the user specify
> which element to use for the extra, and then 5th that says
> split the extra between H1 and He4, and then a 6th that
> says distribute the extra over all the isotopes, and then ....
>
> everyone should keep in mind that we already have 2
> completely general ways to see any uniform composition
> by giving the set of desired mass fractions.    one is
> set_uniform_xa_from_file and the other is set_to_xa_for_accretion.
>
> so at some point we'll stop adding options and just say
> "use one of the general schemes".    but if you think it is
> important to add “dump into the most abundant isotope”
> then i'll take another look at how to do it.   you say.
>
> -Bill
>
>
>
>
>
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