[mesa-users] Getting uniform coverage of the upper main-sequence / post main-sequence

[Robert FARMER]

If you limit the max timestep to the smallest any of those models take you
can force them to take similar number of steps. Though it is a bit of a
brute force approach.

Rob

On Tue, Feb 3, 2015 at 5:20 PM, Richard Townsend <townsend at astro.wisc.edu>
wrote:

> Hi folks —
>
> I’m running a grid of 101 massive-star evolutionary tracks (over the mass
> range 2.5 < M < 25, logarithmically spaced in M) with an eye to mapping out
> instability strips. For each M, I use MESA to evolve from the ZAMS through
> to the point where Teff < 6,600K.
>
> Perhaps naively, I was expecting the tracks to each contain a similar
> number of steps — and that the (log Teff, log L) values from all steps of
> all tracks would, in some sense, cover the HR diagram reasonably smoothly.
>
> However, I’m finding this not to be the case — tracks with neighboring
> masses often contain very different numbers of steps. To illustrate this, I
> attach here a plot of #stesp vs. mass.
>
>
> Can anyone enlighten me as to why the number of steps jumps around so much
> — and what I might do to obtain more predictable behavior? I’m digging
> through the log files right now, but I thought I should check whether there
> is a known solution out there.
>
> cheers,
>
> Rich
>
>
>
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