[Mesa-users] Mesa-users Digest, Vol 52, Issue 4

Fri Nov 5 14:03:50 UTC 2021

Hi Aaron,Rob, Mitchell
I am also interested in heavy iostopes abundance which are not included in small network in star evolution. So I did some test and got some results.
1.If the isotopes are not included in network,and I set to disply these isotopes' abundence in profile file.In profile files,all isotopes which are not included in network disply 0 mass fraction.
2.If the isotopes are included in network,but there are no reaction involving these isotopes.Then the isotopes' mass fraction disply in profile files.For different metallicity Z, the ratio among isotopes are the same.
3.The setting are same as 2,and I add the flag 'dump_missing_metals_into_heaviest = .true.' in inlist file.The result is same as 2,there are no other isotopes disply in profile files.
So I have some questions as follow:
1.In different metallicity Z,is the ratio among all isotopes fixed?what is the ratio? Which paper do this ratio refer?
2.Why didn't the flag 'dump_missing_metals_into_heaviest = .true.' work?
Any suggestions or help would be very appreciated!
sincerely!
Liguo

At 2021-11-04 20:00:03, mesa-users-request at lists.mesastar.org wrote:
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>Today's Topics:
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>   1. Re: [Fe/H] Calculation with MESA Outputs (Aaron Dotter)
>   2. Re: c13_pocket stop running during TACHeB (Rob Farmer)
>   3. Re: c13_pocket stop running during TACHeB (Liguo)
>   4. Fw: University of Sydney Postdoctoral Research Associate in
>      Stellar Astrophysics (women only) (Dennis Stello)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Wed, 3 Nov 2021 08:11:14 -0400
>From: Aaron Dotter <aaron.dotter at gmail.com>
>To: Rob Farmer <robert.j.farmer37 at gmail.com>
>Cc: Mitchell Dennis <mtde226 at hawaii.edu>, mesa-users
>	<mesa-users at lists.mesastar.org>
>Subject: Re: [Mesa-users] [Fe/H] Calculation with MESA Outputs
>Message-ID:
>	<CAN5--jNBGjtMpbLr1RpLnZRJpOA7TOGZbZFC5vnXfc+pqoJruQ at mail.gmail.com>
>Content-Type: text/plain; charset="utf-8"
>
>Hi Mitchell,
>
>A couple of additions to Rob's good suggestion.
>
>- You can add isotopes to a network without adding the nuclear reactions.
>For example, if you're interested in tracking the surface evolution of Fe56
>in solar type stars, which won't create or destroy Fe56, then you can still
>use a simple net like basic for energy generation but also track the mixing
>history of other isotopes.
>
>- Whether you do the above or not, beware of a little known feature in
>MESA: In the star_job inlist there is a flag called
>
>      ! dump_missing_metals_into_heaviest
>      ! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>      ! this controls the treatment metals that are not included in the
>current net.
>      ! if this flag is true, then the mass fractions of missing metals are
>added
>      ! to the mass fraction of the most massive metal included in the net.
>      ! if this flag is false, then the mass fractions of the metals in the
>net
>      ! are renormalized to make up for the total mass fraction of missing
>metals.
>
>      ! ::
>
>    dump_missing_metals_into_heaviest = .true.
>
>What this means is that any elements in the solar mixture that are not
>explicitly included in the network are going to be added to the heaviest
>element in the network.  Depending on the network you choose, this may be a
>small fraction.  If you use an approx21 net, or follow my suggestion above,
>make sure that the element you want to track is not the heaviest in the net
>(or turn the above flag to false but then you have a different problem . .
>.).
>
>See attached example.  I use Zn64 as a placeholder for all the extras so
>that Fe56 will just be Fe56.
>
>Aaron
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>------------------------------
>
>Message: 2
>Date: Wed, 3 Nov 2021 14:03:13 +0100
>From: Rob Farmer <robert.j.farmer37 at gmail.com>
>To: Liguo <liguo070923 at 163.com>
>Cc: mesa-users <mesa-users at lists.mesastar.org>
>Subject: Re: [Mesa-users] c13_pocket stop running during TACHeB
>Message-ID:
>	<CAPvTSya47h2RX054jJ11oh_=09+Py3gxXvfaimpsZMGs1dQE1w at mail.gmail.com>
>Content-Type: text/plain; charset="utf-8"
>
>Hi,
>That's not enough information to diagnose a problem.
>
>You need to show your inlists (and your nuclear network).
>
>What is your star doing when it stops?
>Have you made any plots to try to diagnose the problem yourself?
>Are there regions of the star where it seems like mesa is having
>difficulties?
>What have you tried to do to fix the problem yourself?
>
>Rob
>
>On Tue, 2 Nov 2021 at 09:47, Liguo via Mesa-users <
>mesa-users at lists.mesastar.org> wrote:
>
>> Dear MESA Mailing List,
>>   I can run c13_pocket successfully with it's default setting.But when I
>> changed it's net to bigger net than agb.net,It will stop running in
>> TACHeB phase with error as follow:
>>   stopping because of problems dt < min_timestep_limit
>>   My net have about 250 isotopes.
>>   Any suggestions or help would be very appreciated!
>>
>>   sincerely!
>>   Liguo
>>
>>
>>
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
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>------------------------------
>
>Message: 3
>Date: Thu, 4 Nov 2021 10:49:58 +0800 (CST)
>From: Liguo  <liguo070923 at 163.com>
>To: "Rob Farmer" <robert.j.farmer37 at gmail.com>,  mesa-users
>	<mesa-users at lists.mesastar.org>
>Subject: Re: [Mesa-users] c13_pocket stop running during TACHeB
>Message-ID: <668e3033.2111.17ce8da62d2.Coremail.liguo070923 at 163.com>
>Content-Type: text/plain; charset="gbk"
>
>Dear Rob
>Thank you for your reply!
>My star stopped running after h burning and before he burning.
>I have tried to set min_timestep_limit = 1d-20.Star then stopped running with error segmentation fault-invalidmemory reference.
>I attach my inlist and net file in the end.
>I only change net to my net in inlist_common of c13_pocket.
>
>
>sincerely!
>Liguo
>
>
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>
>? 2021-11-03 21:03:13?"Rob Farmer" <robert.j.farmer37 at gmail.com> ???
>
>Hi,
>
>That's not enough information to diagnose a problem.
>
>
>You need to show your inlists (and your nuclear network).
>
>
>
>What is your star doing when it stops?
>
>Have you made any plots to try to diagnose the problem yourself?
>
>Are there regions of the star where it seems like mesa is having difficulties?
>
>What have you tried to do to fix the problem yourself?
>
>
>Rob
>
>
>
>On Tue, 2 Nov 2021 at 09:47, Liguo via Mesa-users <mesa-users at lists.mesastar.org> wrote:
>
>Dear MESA Mailing List,
>  I can run c13_pocket successfully with it's default setting.But when I changed it's net to bigger net than agb.net,It will stop running in TACHeB phase with error as follow:
>  stopping because of problems dt < min_timestep_limit
>  My net have about 250 isotopes.
>  Any suggestions or help would be very appreciated!
>
>
>  sincerely!
>  Liguo
>
>
>
>
> 
>
>_______________________________________________
>mesa-users at lists.mesastar.org
>https://lists.mesastar.org/mailman/listinfo/mesa-users
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>------------------------------
>
>Message: 4
>Date: Thu, 4 Nov 2021 15:24:55 +1100
>From: Dennis Stello <dennis.stello at sydney.edu.au>
>To: Mesa-users <mesa-users at lists.mesastar.org>
>Subject: [Mesa-users] Fw: University of Sydney Postdoctoral Research
>	Associate in Stellar Astrophysics (women only)
>Message-ID: <88bd20ef-ec99-2671-51a4-b0b8dd9e134e at sydney.edu.au>
>Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
>Dear mesa users,
>
>A potential opportunity to work on stars in Sydney.
>
>Best
>Dennis/
>
>
>-------- Forwarded Message --------
>Subject: 	Fw: University of Sydney Postdoctoral Research Associate in 
>Stellar Astrophysics (women only)
>Date: 	Thu, 4 Nov 2021 04:20:24 +0000
>From: 	Tim Bedding <tim.bedding at sydney.edu.au>
>To: 	Dennis Stello <d.stello at unsw.edu.au>
>
>
>
>Hi Dennis,
>
>Can you please forward to the MESA list?
>
>thanks
>
> ? ?Tim
>
>------------------------------------------------------------------------
>
>The University of Sydney is welcoming applications for a three-year 
>*Postdoctoral Research Associate in Stellar Astrophysics (women only)*. 
> ? The successful applicant will be working with Tim Bedding 
><mailto:tim.bedding at sydney.edu.au>?and Daniel Huber?in 
>*asteroseismology, exoplanets or other related areas of stellar 
>astrophysics*.??More details can be found here 
><https://protect-au.mimecast.com/s/dqdXCjZ1N7in8k2JXfW0iOZ?domain=usyd.wd3.myworkdayjobs.com>?or 
>on the AAS jobs register. Applications close 28-Nov-2021.
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>End of Mesa-users Digest, Vol 52, Issue 4
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