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

[lijiaxun at mail.ustc.edu.cn]

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.


But this is different from Fig. 15 in paper Modules for Experiments in Stellar Astrophysics (MESA) 2010. This picture is shown following.


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
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