[Mesa-users] Question

[d10631026陳瑜安]

Thanks a lot!

Warrick Ball <W.H.Ball at bham.ac.uk> 於 2019年1月21日 週一 下午4:11寫道：

> Hi Ann,
>
> If you want to know more about a particular item in the history output,
> the first place to look is the defaults file (if you haven't already) at
> $MESA_DIR/star/defaults/history_columns.list.  I presume from there you
> can see that `log_Lnuc` is the sum of the energy produced by nuclear
> reactions (excluding neutrino losses and photodisintegrations).
> Presumably `log_Lnuc_erg_s` is the same thing in units of erg/s rather
> than Lsun (solar luminosities).
>
> `total_energy` is quite different.  This is an integral of all the
> energies in the star, not energy *rates* like the nuclear reactions.  I
> encourage you to search for the `total_energy` in the source code with
> e.g.
>
>      grep total_energy $MESA_DIR/star/p*/*.f*
>
> and sift through the output.  I've just done so myself and it looks like
> the total energy is computed by the subroutine
> `eval_total_energy_integrals` in `star/private/star_utils.f90`, which
> itself calls `eval_section_total_energy_integrals` over the whole star.
> From the function call alone, it looks like `total_energy` is the sum of
> the internal, gravitational potential, linear kinetic and rotational
> kinetic energies.  I would presume this is in ergs.
>
> Cheers,
> Warrick
>
>
>
>
>
>
> ------------
> Warrick Ball
> Postdoc, School of Physics and Astronomy
> University of Birmingham, Edgbaston, Birmingham B15 2TT
> W.H.Ball at bham.ac.uk
> +44 (0)121 414 4552
>
>
> On Sat, 19 Jan 2019, d10631026 at gapps.fg.tp.edu.tw wrote:
>
> >
> > Dear mesa users:
> >
> >
> > Could I ask what is the difference between log_Lnuc_ergs_s and
> total_energy in the history.data of example_ccsn_IIp?
> >
> > Thanks a lot!
> >
> >
> > Ann
> >
> >
> >
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