[mesa-users] How to make mesa write output at specific ages?

[Bill Paxton]

This plot from the 1st mesa instrument paper depended on getting information at particular ages.


The mesa/star/test_suite case cool_brown_dwarf has run_star_extras setup to do this.   Look at the extras_check_model routine.

If you'd like to save a profile at a particular age, call star_write_profile_info from run_star_extras -- you can provide a filename for the saved profile.  

Cheers,
Bill














On Feb 4, 2016, at 1:22 PM, Robert Farmer wrote:

> Hi
>  If you look in http://mesa.sourceforge.net/controls_defaults.html#controls_for_output then you'll see controls for history_interval and profile_interval which determine how often mesa writes out data based on model numbers. So you could set the output to be every step (history files this is fine for, but don't do it for your profile files as you'll fill your hard drive up!), then after the run just find the nearest model number(s) to your target age(s) and read off the data. You could get fancy and interpolate between two model numbers.
> 
> The other option would be to do it via a run_stars_extra code see http://mesa.sourceforge.net/run_star_extras.html#toc-1-4 for an example of how to determine when to output data.
> 
> Rob
> 
> 
> 
> On Fri, Feb 5, 2016 at 12:56 AM, Earl Bellinger <bellinger at mps.mpg.de> wrote:
> I put an accidental slash in that sed command, it should read:
> 
>     sed -i.bak "s/max_age = 4.57e9/max_age = 13.8e9/g" inlist_1.0
> 
> 
> Earl Bellinger 
> Stellar Ages & Galactic Evolution Group 
> Max-Planck-Institut für Sonnensystemforschung 
> 
> On Thu, Feb 4, 2016 at 2:55 PM, Earl Bellinger <bellinger at mps.mpg.de> wrote:
> Hi Pritesh,
> 
> The MESA controls inlist has the option
> 
>     max_age
> 
> which you can set, for example, to the age of the sun:
> 
>     max_age = 4.57e9
> 
> If you want to output multiple ages, you can write a bash script that will run the script until the desired age, then sed out that age and put in the new one, run until the next desired age, etc. It might look something like:
> 
> mk
> rn
> sed -i.bak "s/\max_age = 4.57e9/max_age = 13.8e9/g" inlist_1.0
> rn
> 
> which will run until the age of the sun, then change the max age to the age of the universe, and then rerun until then. 
> 
> There are also controls for the timestepping, for example you can change max_years_for_timestep. 
> 
> Good luck!
> 
> 
> Earl Bellinger 
> Stellar Ages & Galactic Evolution Group 
> Max-Planck-Institut für Sonnensystemforschung 
> 
> On Thu, Feb 4, 2016 at 12:03 PM, pritesh ranadive <astroprit at gmail.com> wrote:
> Hi I am Pritesh, I am new to mesa, I wish to write the mesa output at specific ages during the evolution of the star.
> How do I do this? Is there a direct control in the mesa defaults for this?
> 
> - Pritesh
>   Astronomy Olympiad Cell
>   HBCSE - TIFR.
> 
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