[mesa-users] Rotation velocity problem 2

trobolo dinni trobolo.trobolo.dinni5 at gmail.com
Mon Dec 17 20:19:10 EST 2012

Dear MESA users,

sorry for the double message, but the first one appears to be non-readable,
maybe because I attached a plot, so I am posting it again (the plot which I
refer to is attached to the other message).
Sorry again.

I would like to ask a suggestion to understand the MESA outputs from a
rotating star.
I simply launched a basic 1Msun from preMS to WD simulation by using the
default inlist file, but I added a solid-body rotation beginning from ZAMS.
Now, what I want to check is the surface rotation velocity during RGB so I
set up my profile_column.list file to show me the rotational parameters, in
particular omega (expressed in Hz) and v_rot (which, as said in
the profile_column.list file is expressed in Km/s).

My doubt is now the following, when I went read the numbers on the surface
of the star in a profile file, what I read is:

r_div_R                                  radius
           omega                                     v_rot

1.0000000000000000E+000     8.0820064813736806E+001
  3.0743441369562425E-008       1.7292924054249237E+000

which should mean that the rotation velocity on the surface is ~1.73 Km/s.
Then I tried to do a rough estimation of v_rot from omega by simply using
the relation:

v_rot = 2pi*radius*omega

and what I get is

v_rot ~ 10.9 Km/s

which is completely different from what the output in the profile tells me.
Also, from the final plot of the simulation (attached) the v_rot seems to
be at least greater of ~8 (I supposed that the scale in the plot is in

I would like to ask if in your opinion my reasoning is correct or how I
should interpret the v_rot parameter in the profile file.

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