[Mesa-users] A question about MESA for low mass pre-main-sequence evolution

[Francis Timmes]

hi lijiaxun,

about a month before public release r21.12.1 (so about a year ago) i redid fig 15 of mesa I. 
attached are my inlists and the resulting plot prems_hr.pdf.
have fun!

fxt





> On Oct 29, 2022, at 7:47 AM, LiJiaxun via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hi,
> My name is Li Jiaxun. I am a student who have just started to learn MESA. I want to calculate low mass pre-main-sequence star to main-sequence. So I choose the $MESA_DIR$/star/test_suite/make_zams_low_mass for template. 
> In order to calculate metal abundance Z=0.019, Helium abundance Y=0.275 and M=0.085 M_sun or M=0.2 M_sun, I only changed the following Settings
> "
> set_abundance = .true.
> set_initial_abundance = .true.
> chem_name = 'h2'
> new_frac = 2e-5
> 
> change_initial_net =.true.
> new_net_name = 'pp_and_cno_extras.net'
> "
> in inlist_zams, &star_job, and
> "
> Zbase = 0.019d0
> "
> in inlist_zams, &kap, and
> "
> initial_mass = 0.2d0
> initial_z = 0.019d0
> initial_y = 0.275d0
> 
> " in inlist_zams, &controls.
> The complete code in the attachment. The calculation results are shown in the figure below.<desc.png>
> 
> But this is different from Fig. 15 in paper Modules for Experiments in Stellar Astrophysics (MESA) 2010. This picture is shown following.<desc.png>
> 
> a) The shape of the trajectory is not quite the same as the trajectory on the paper.
> b) The ending of the evolution is different. For example, the ending of the 0.2 M_sun trajectory in my results, Log Teff=3.55, the ending of the 0.2 M_sun in paper's results, Log Teff < 3.525.
> 
> Is there something I haven't considered. Sorry, I just started mesa. Would you please give me some suggestions for this problem. Thanks you a lot.
> 
> Thanks
> LiJiaxun<0.2M_sunY=0.275Z=0.019add_deuterium.rar>
> _______________________________________________
> mesa-users at lists.mesastar.org
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