[mesa-users] Pre-MS to Wolf-Rayet Evolution Problem

[Irham Taufik]

Dear Frank Timmes,

Thank you for your comments and help.
At that phase the program is automatically terminated and give this message
"stopping because of convergence problems dt < min_timestep_limit". So why
the evolution of this star can not reach Wolf-Rayet phase? I attached the
screenshot of my terminal output in this email.

Best regards,
Irham

On 17 October 2016 at 08:29, Frank Timmes <fxt44 at mac.com> wrote:

> dear irham,
>
> please look at your plots and make as strong an effort
> as you can on your own to understand what is going on.
> for example, what stage of evolution is the core in?
> how does this stage of core evolution relate to motion,
> or lack of motion as the case may be, in an hr diagram?
>
> i apologize for not having more time in this discussion board
> to guide you towards a better grasp of your plots or
> standard stellar evolution. what i will say is your plots suggest
> (a) mesa appears to be working just fine and (b) core-collapse is imminent.
>
> fxt
>
>
>
>
>
> > On Oct 16, 2016, at 9:02 PM, Irham Taufik <irham.andika at gmail.com>
> wrote:
> >
> > Dear all,
> >
> > I attached a figure that shows evolutionary track followed by my star.
> As I mention before, the track is stuck at the phase that is marked by red
> circle and can not reach next stage. At that phase the timesteps of
> computation become small but I don't know why.
> >
> > Frank Timmes, can you explain me more about "a very thin surface layer
> might be causing the small timesteps" ?
> >
> >
> > Best regards,
> > Irham
> >
> > On 17 October 2016 at 01:29, Frank Timmes <fxt44 at mac.com> wrote:
> > one reason for my question, as matteo noted, is the lack
> > of a TPAGB phase for massive stars. in addition, the “WR phase”
> > is usually taken to mean a stripping of the outer hydrogen envelope
> > that exposes the products of core burning which have been transported
> > to the outer layers (wn, wc, wo …)
> >
> > my current suggestion is to do a more complete analysis of
> > the evolution - how much mass has been lost, what do the
> > abundance profiles look like, etc. i suspect, but do not know,
> > that a very thin surface layer might be causing the small timesteps.
> >
> > fxt
> >
> >
> >
> >
> >
> >
> > > On Oct 16, 2016, at 8:34 AM, Irham Taufik <irham.andika at gmail.com>
> wrote:
> > >
> > > Dear Frank Times,
> > >
> > > I attached the evolutionary track of 32 Msun star that is taken from
> Geneva Stellar Database. Basically, I want to create similar evolutionary
> track using MESA with same input parameters as in Geneva model.
> > >
> > > However, my star stuck in the TPAGB phase (red oval) can not reach
> desired WR phase (green oval) because the computation is very slow. Is
> there something wrong with my inlist?
> > >
> > > Best regards,
> > > Irham
> > >
> > > On Oct 16, 2016 10:09 PM, "Frank Timmes" <fxt44 at mac.com> wrote:
> > > hi irham,
> > >
> > > it might be useful to know how “WR phase” and “TPAGB” are defined for
> a 32 msun model.
> > >
> > > fxt
> > >
> > >
> > >
> > >
> > > > On Oct 16, 2016, at 5:05 AM, Irham Taufik <irham.andika at gmail.com>
> wrote:
> > > >
> > > > Dear all,
> > > >
> > > > Currently I use MESA to create evolution model of 32 M_sun star from
> pre-MS to Wolf-Rayet phase. However, it seems the program only works until
> TPAGB and cannot reach WR phase. I attached my inlist file in this email.
> Is there something wrong with my input parameters?
> > > >
> > > > Best regards,
> > > > Irham
> > > >
> > > >
> > > >
> > > > --
> > > > Irham Taufik Andika
> > > > Astronomy Study Program
> > > > Bandung Institute of Technology, Indonesia
> > >
> > > <figure_1.png>
> >
> >
> >
> >
> > --
> > Irham Taufik Andika
> > Astronomy Study Program
> > Bandung Institute of Technology, Indonesia
> > <wr_mod1.png>
>
>


-- 
Irham Taufik Andika
Astronomy Study Program
Bandung Institute of Technology, Indonesia
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