[mesa-users] abundances of all isotopes

[Bill Paxton]

On May 7, 2014, at 1:57 PM, Mathieu wrote:

> Hi Bill,
> 
> thanks for the reply.
> 
> If MESA ignores the abundances of the isotopes in mesa/data/rates_data/ecapture_states.list , then how does it calculate the electron capture rates? Only using the isotopes both in the network and in that file? That's not clear to me...



josiah is the one to answer that question.




> 
> Cheers,
> 
> Mathieu
> 
> On 05/07/2014 01:47 PM, Bill Paxton wrote:
>> Hi Mathieu,
>> 
>> This is an interesting question --- mesa ignores all isotopes that are not in the current reaction network.  so if you want to estimate other abundances, you are on your own for now.   perhaps you could use the value of Z from mesa and use one of the metals abundance compilations to calculate the abundance assuming that particular distribution.   (see e.g., AG89_element_zfrac and friends in chem/public/chem_def).
>> 
>> or you could find the element abundance in your composition from mesa/star and then use Lodders (2003) isotopic percentages to get isotope abundances.
>> 
>> good luck!
>> 
>> if you come up with a scheme you like, let us all know -- perhaps it belongs in mesa.
>> 
>> cheers,
>> Bill
>> 
>> 
>