[mesa-users] Problem with evolving pure helium stars

[Aaron Dotter]

Hi Ylva,

You say "when the star should start burning it doesn't succeed".  What are
you expecting to happen?  It's not going to do H-burning so the first
burning phase will be He burning via triple-alpha.  That should start
at roughly 10^8 K but I can well imagine that it is never able to reach
such a high temperature via contraction.

What is the age of the "star" when the run stops?
What is the maximum central temperature achieved?
What is the surface gravity at the end of the run?

Aaron

On Wednesday, September 9, 2015, Ylva Götberg <y.l.l.gotberg at uva.nl> wrote:

> Hello everyone,
>
> I am trying to evolve single stars made of helium and with solar
> metallicity (no hydrogen at all). They don’t find a solution after 50 000
> models (varcontrol), so I guess I wrote something wrong. In the
> inlist_project I have put the following lines to specify it is a helium
> star:
>
>   ! Initial metallicity
>     initial_z = 0.0134
>
>   ! Helium content
>     initial_y = 0.9866
>
> and nothing else. The pre-main sequence goes well, but when the star
> should start burning it doesn’t succeed. I have tried masses of 0.5 MSun
> and 5.5 MSun.
>
> Is there anyone who knows what is happening and how I can solve this?
>
> Cheers,
> Ylva (PhD in Amsterdam)
>
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