[mesa-users] TP-AGB and Post-AGB Mass Loss Issues
Ian Foley
ifoley2008 at gmail.com
Thu Feb 11 21:38:59 EST 2016
Hi Matteo,
Worked great! Thanks
Ian
On 12 February 2016 at 13:31, Matteo Cantiello <cantiel at kitp.ucsb.edu>
wrote:
> Hi Ian,
> Here’s a link to a folder containing the PDFs: http://bit.ly/1SL5HiK
> Let me know if that works and please do not hesitate to send me more
> requests if you need more literature.
> Honestly I find it outrageous that we still need to do use such tricks to
> provide literature to interested taxpayers.
> It makes no sense to me. Ok, sorry for the rant…
>
> -M
>
>
> Matteo Cantiello | http://matteocantiello.com/
> Specialist in Astrophysics | Kavli Institute for Theoretical Physics
> Chief Scientist and Board Member, Authorea | https://www.authorea.com/
>
> On Feb 11, 2016, at 6:17 PM, Ian Foley <ifoley2008 at gmail.com> wrote:
>
> Hi Falk,
>
> Really appreciate your response. All three look good articles to read. The
> book in the first reference is $250 at least from Amazon and has no ebook
> version.
>
> However, my employment is now private. I used to lecture in computer
> science, but I am now no longer attached to a university or research
> institute, I will have to pay for them and will probably do so for one at
> least if I have to.
>
> However, is there anyway of getting the articles much cheaper or free? I
> think they are $32 each.
>
> Thanks
> ian
>
> On 12 February 2016 at 13:00, Falk Herwig <fherwig at uvic.ca> wrote:
>
>> Hi Ian,
>> another set of questions are answered in review publications, such as
>> these:
>> http://adsabs.harvard.edu/abs/2013pss4.book..397H
>> http://adsabs.harvard.edu/abs/2005ARA%26A..43..435H
>> http://adsabs.harvard.edu/abs/2006PASP..118..183W
>> Forgive me the author bias, but these sprung to mind most quickly.
>> Best, Falk.
>>
>>
>> > On Feb 11, 2016, at 5:42 PM, Francis Timmes <fxt44 at mac.com> wrote:
>> >
>> > many of your questions could be answered by
>> > you studying the source code. have you looked?
>> >
>> > fxt
>> >
>> >
>> >
>> >
>> >
>> >> On Feb 11, 2016, at 6:10 PM, Ian Foley <ifoley2008 at gmail.com> wrote:
>> >>
>> >> As part of my personal education of Stellar Evolution, I have been
>> >> running the 1M pre ms to wd test suite case up to 9M and trying out
>> >> and learning about the inlist.
>> >>
>> >> The big issue I see is to understand how mass loss is applied and its
>> >> relationship to the thermal pulses.
>> >>
>> >> Very evident is that if I increase the RGB and AGB scaling factors ( I
>> >> have tried from 0.1 up to 8) it flattens out and reduces the number of
>> >> thermal pules I suspect this is because as we increase the mass loss
>> >> via the mass loss formulae, the larger and more frequent TP's are not
>> >> needed to remove the mass.
>> >>
>> >> This has led me to try to find answers to the following questions.
>> >>
>> >> 1. Is the mass loss formula applied to every zone to compute the loss?
>> >> If yes, why isn't mass loss calculated by using the radial velocity
>> >> and computing the amount of matter expelled through the star's outer
>> >> zone. If no, how is the formula applied?
>> >>
>> >> 2. Is the mass loss formula applied only to H? Or is it applied to He
>> >> and others as well?
>> >>
>> >> 3. I have been primarily using the Reimer and Blocker mass loss
>> >> formula which is I think a heuristic formula determined by
>> >> experimental observations. However, it does seem to be applied fairly
>> >> independently of the actual stellar evolution equations. Since we
>> >> don't know very well from experiment the number and scale of the TP's
>> >> how can we know what is a good scaling factor to use.
>> >>
>> >> 4. In relation to the new solar wind additions in r8118 over r7624
>> >> it's not quite clear to me what is the relation between the Reimer and
>> >> Blocker terms and turning on and off the the cool wind dependent on
>> >> temperature. Are the Reimer and Blocker factors still needed and the
>> >> cool wind temperature terms just configure when they are activated?
>> >>
>> >> 5. I have similar issues with the convection overshooting. Although it
>> >> seems likely to be important it seems we have no idea of the
>> >> appropriate number to apply. And, like mass loss, the bigger the
>> >> factors you choose the more it dampens the TP's.
>> >>
>> >> 6. How is the mass loss formula's applied in the post-AGB phase? Does
>> >> the Blocker term just switch off at some point and if so when? Why
>> >> does it seem that there is no He loss in the post-AGB phase?
>> >>
>> >> 7. I find it very strange that in the post-AGB phase the lg_LH term in
>> >> the terminal output is still up close to the total lg_L even when
>> >> there is almost no hydrogen left and what hydrogen there is in the
>> >> outer zones of the envelope.
>> >>
>> >> step lg_Tcntr Teff lg_LH lg_Lnuc Mass
>> >> H_rich
>> >> H_cntr N_cntr Y_surf X_avg eta_cntr zones retry
>> >> lg_dt_yr lg_Dcntr lg_R lg_L3a lg_Lneu lg_Mdot
>> >> He_core He_cntr O_cntr Z_surf Y_avg gam_cntr iters
>> >> bckup
>> >> age_yr lg_Pcntr lg_L lg_LZ lg_Psurf lg_Dsurf
>> >> C_core
>> >> C_cntr Ne_cntr Z_cntr Z_avg v_div_cs dt_limit
>> >>
>> >> 39400 8.211499 2.889E+04 4.255626 4.354482 0.985786
>> >> 0.000116 0.000000 0.000000 0.374091 0.000065 49.353686 2183
>> >> 5037
>> >> -5.801543 7.277248 0.753659 3.545685 3.889458 -4.012795
>> >> 0.985670 0.000000 0.579524 0.020125 0.001666 7.754729 6
>> >> 31
>> >> 3.5571E+07 24.321104 4.303656 3.038122 3.281056 -10.342147
>> >> 0.982096 0.394597 0.001949 1.000E+00 9.983E-01 0.000E+00
>> >> varcontrol
>> >>
>> >> Is this OK or is there a problem with the software?
>> >>
>> >>
>> >> I would be very grateful for any help in answer to these questions
>> >> Ian
>> >>
>> >>
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>> >
>> >
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>> --
>> Falk Herwig
>> Dept of Physics & Astronomy, U of Victoria
>> fherwig at uvic.ca, tel: +1 (250) 721-7743
>>
>>
>>
>>
>
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