[Mesa-users] MESA Rotation

[Thomas Steindl]

Hi Chris,

Thanks for clarifying! Indeed, I don’t think there is an easy solution for that. The evolution of the rotational velocity will depend on many parameters, including wether you are calculating classical models (create_pre_main_sequence_model = .true.) or include the evolution of a protostellar seed during the accretion phase. The description of rotation on the pre-main sequence is very tricky, since you would have to take the star-disk interaction into account.

If you want a pre-main sequence model ending at a specific rotation velocity, I think you will have to calculate multiple models and iterate upon their results (some kind of shooting method).

I am sorry I could not be of more help!

Thomas 
__________________________________________________________________

Thomas Steindl, MSc
University of Innsbruck | Institute for Astro- and Particle Physics
Tel: +43 512507 52031
Mail: thomas.steindl at uibk.ac.at
Homepage: www.thomassteindl.com

> Am 16.09.2022 um 00:29 schrieb Chris Wang <lwang178 at jhu.edu>:
> 
> Hi Thomas,
> Thanks for your reply. Yes the PMS phase is important to my research. I’m interested to see how the PMS star evolves with a given ZAMS rotation rate, but it looks like MESA only supports setting an initial rotation rate. Do you have any advice on that? Thank you!
> Best,
> Chris
>  
> From: Thomas Steindl <thomas.steindl at uibk.ac.at <mailto:thomas.steindl at uibk.ac.at>>
> Date: Thursday, September 15, 2022 at 11:39 AM
> To: Chris Wang <lwang178 at jhu.edu <mailto:lwang178 at jhu.edu>>
> Cc: mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org> <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>>
> Subject: Re: [Mesa-users] MESA Rotation
> 
> 
>       External Email - Use Caution      
> 
>  
> 
>  
> 
> Hi Chris,  
>  
> I am not sure if I fully understand the question. 
> Are you only interested in having a ZAMS model with a specific rotation velocity or are you interested in the how the star obtained that rotation velocity, i.e. is the pre-main sequence phase to get the star to the ZAMS important for your research?
>  
> Best, 
> Thomas
> __________________________________________________________________
> 
> Thomas Steindl, MSc
> University of Innsbruck | Institute for Astro- and Particle Physics
> Tel: +43 512507 52031
> Mail: thomas.steindl at uibk.ac.at <mailto:thomas.steindl at uibk.ac.at>
> Homepage: www.thomassteindl.com <https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.thomassteindl.com%2F&data=05%7C01%7Clwang178%40jhu.edu%7Cb9e7f5ce65c74aab44cf08da973077c7%7C9fa4f438b1e6473b803f86f8aedf0dec%7C0%7C0%7C637988531682752021%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=6rYfUNTMY70Yh227yGKhkoK8xkUnlLM1es78vXLIY%2FM%3D&reserved=0>
> 
> 
> Am 13.09.2022 um 19:24 schrieb Chris Wang via Mesa-users <mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>>:
>  
> Dear MESA users,
> I am new to MESA, so please bear with me if this question looks too stupid.
> I've been using MESA to simulate the evolution Pre-Main Sequence stars. In my project, I need to set up an initial rotation rate for the pre-main sequence star to evolve, so that when the star reaches the ZAMS, it has exactly a particular rotation velocity (say 1 rev per day). I can certainly try different initial rotation rates and see how the rate changes when the star evolves to the ZAMS, but since I will be simulating many different stellar models with different stellar mass and metallicity, that is probably not feasible since the initial condition would then be different for each different model. I'm wondering whether there is a more efficient solution to set up an initial rotation rate so that the rotation rate at ZAMS evolve exactly to a particular value? Any help would be really appreciated!!!
> Best,
> Chris Wang
> Sophomore Physics Student at JHU
>  
> _______________________________________________
> mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>
> https://lists.mesastar.org/mailman/listinfo/mesa-users <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.mesastar.org%2Fmailman%2Flistinfo%2Fmesa-users&data=05%7C01%7Clwang178%40jhu.edu%7Cb9e7f5ce65c74aab44cf08da973077c7%7C9fa4f438b1e6473b803f86f8aedf0dec%7C0%7C0%7C637988531682752021%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=enrDjdCFNmEzr8PmcCp462NrX9%2FEeUbQi7LvZxbb3VQ%3D&reserved=0>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20220916/62f687d9/attachment.htm>