[mesa-users] TP-AGB and Post-AGB Mass Loss Issues

Thu Feb 11 21:31:57 EST 2016

Hi Ian,
Here’s a link to a folder containing the PDFs: http://bit.ly/1SL5HiK <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 <mailto: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/2013pss4.book..397H>
> http://adsabs.harvard.edu/abs/2005ARA%26A..43..435H <http://adsabs.harvard.edu/abs/2005ARA%26A..43..435H>
> http://adsabs.harvard.edu/abs/2006PASP..118..183W <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 <mailto: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 <mailto: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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> 
> --
> Falk Herwig
> Dept of Physics & Astronomy, U of Victoria
> fherwig at uvic.ca <mailto:fherwig at uvic.ca>, tel: +1 (250) 721-7743 <tel:%2B1%20%28250%29%20721-7743>
> 
> 
> 
> 
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