[Mesa-users] Error in modelling for pp chain( ierr from write_star_job)

[anne.thoul at uliege.be]

Hi Piyush,

I don’t understand your question. The values you want are in the history.data file, which is just a text file. 
You just need to read them in the file, using any program you usually use to do this kind of thing.

Anne


> Le 23 juil. 2018 à 09:24, Piyush Kumar via Mesa-users <mesa-users at lists.mesastar.org> a écrit :
> 
> Hello!!
> Is there any  other way to get the numerical values of the quantities at each model number from history.data file apart from manually noting all the values?
> Thanks!!
> Best,
> Piyush
> 
>> On 18-Jul-2018, at 12:29 AM, Jared Goldberg <goldberg at physics.ucsb.edu <mailto:goldberg at physics.ucsb.edu>> wrote:
>> 
>> Hello Piyush, 
>> 
>> Are you trying to study the relationship between the masses of different stars and their luminosities (and/or radius) on the main sequence? 
>> 
>> Or are you trying to study Luminosity as a function of mass coordinate inside a single star?  (How does luminosity change as you move throughout a single star?)
>> 
>> The parameter initial_mass controls how massive a single stellar model is at the beginning of a MESA run. Typically, the mass of the model then only changes if you include some physics that would cause a change in mass, such as mass loss from a wind, or mass gain from accretion. 
>> 
>> Therefore, if you're trying to study the relationship between the masses of different stars and their luminosities, then you should make multiple models of different stars with different initial_mass (such as, initial_mass = 1, initial_mass = 2, initial_mass = 3, and so on, all in different MESA runs) and save their output in different locations (such as, LOGS_1M, LOGS_2M, LOGS_3M, and so on). Then, you can look in your history files for when the star is on the main sequence, and find the radius, luminosity, et cetera at that point in time. Remember -- a small star is not the same as the inner shells of a bigger star. Therefore you can't use the inside of a massive star to model a less massive star. 
>> 
>> On the other hand, if you're trying to study Luminosity as a function of the mass coordinate of a single star more massive than 10 Msun, then you are right to look at the different shells in a profile.
>> 
>> In a profile, you are correct that each value on the mass x-axis is "a point in the star corresponding to a shell which contains that much mass inside it." In a history file, on the other hand, the 'mass' column is simply the total mass of the star at each timestep. 
>> 
>> Hope this helps!
>> 
>> ~Jared
>> 
>> 
>> 
>> On Tue, Jul 17, 2018 at 11:15 AM, Piyush Kumar via Mesa-users <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>> wrote:
>> Hi!!
>> Suppose I want to study relation between mass of star and luminosity near ZAMS, (ZAMS radii and luminosities).
>> So for e.g. I like to do this for mass range 1-10( in Msun units), then is it right that all I need to do is take my initial_mass greater than or equal to 10 for required result? (What I know about the mass x-axis is that each value is a point in the star corresponding to a shell which contains that much mass inside it.)
>> Thanks..
>> Best,
>> Piyush.   
>> 
>>> On 16-Jul-2018, at 10:39 PM, Piyush Kumar via Mesa-users <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>> wrote:
>>> 
>>> Thank you for the clarification. 
>>> 
>>> On Mon, Jul 16, 2018, 10:17 PM Josiah Schwab <jwschwab at ucsc.edu <mailto:jwschwab at ucsc.edu>> wrote:
>>> Hello Piyush,
>>> 
>>> I recommend that you invest a little more time understanding the difference between MESA history and profile output.  The two key file types are history files, which store the value of scalar quantities (e.g. mass, luminosity) at different timesteps and profile files which store the value of spatially varying quantities (e.g. density, pressure) at a single timestep.  Correspondingly, the PGSTAR plots with "profile" in their name are for plotting profile data and the ones with "history" are for plotting history data.
>>> 
>>> Josiah
>>> _______________________________________________
>>> mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users <https://lists.mesastar.org/mailman/listinfo/mesa-users>
>>> 
>> 
>> 
>> _______________________________________________
>> mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>
>> https://lists.mesastar.org/mailman/listinfo/mesa-users <https://lists.mesastar.org/mailman/listinfo/mesa-users>
>> 
>> 
>> 
>> _______________________________________________
>> mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>> 
> 
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20180723/98ddbbcd/attachment.html>