Changes between Version 32 and Version 33 of u/zchen/summary
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- 07/26/16 17:08:46 (9 years ago)
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u/zchen/summary
v32 v33 44 44 3. On physics 45 45 46 3a. Currently, I am using electron excitation as high temperature cooling source [http://adsabs.harvard.edu/abs/1998ApJ...497..303M Mastrodemons & Morris (1998)] and H2 and water as low temperature cooling source [http://adsabs.harvard.edu/abs/1993ApJ...418..263N Neufeld & Kaufman (1993)]. The defect of these method is: it admits the chemical interaction but did not fully take them into account. For example, HII can interact with electron to form HI. This chemical reaction will absorbheat thus making the gas's specific heat change ($\Gamma\sim1$). In [http://adsabs.harvard.edu/abs/2013ApJ...763....6T Tomida et al. (2013)] and [http://adsabs.harvard.edu/abs/2015ApJ...801..117T Tomida et al. (2015)] use statistical mechanics to derive $\Gamma$ table as a function of $\rho$ and $T$. I will use their model in future simulation. A color plot of the table can be found here [http://adsabs.harvard.edu/abs/2016MNRAS.455.4351P Pejcha, Metzger & Tomida (2016)]. Besides, there is new data for high temperature cooling (>10000 K) [http://adsabs.harvard.edu/abs/2007ApJS..168..213G Gnat & Sternberg (2007)].46 3a. Currently, I am using electron excitation as high temperature cooling source [http://adsabs.harvard.edu/abs/1998ApJ...497..303M Mastrodemons & Morris (1998)] and H2 and water as low temperature cooling source [http://adsabs.harvard.edu/abs/1993ApJ...418..263N Neufeld & Kaufman (1993)]. The defect of these method is: it admits the chemical interaction but did not fully take them into account. For example, HII can interact with electron to form HI. This chemical reaction will release heat thus making the gas's specific heat change ($\Gamma\sim1$). In [http://adsabs.harvard.edu/abs/2013ApJ...763....6T Tomida et al. (2013)] and [http://adsabs.harvard.edu/abs/2015ApJ...801..117T Tomida et al. (2015)] use statistical mechanics to derive $\Gamma$ table as a function of $\rho$ and $T$. I will use their model in future simulation. A color plot of the table can be found here [http://adsabs.harvard.edu/abs/2016MNRAS.455.4351P Pejcha, Metzger & Tomida (2016)]. Besides, there is new data for high temperature cooling (>10000 K) [http://adsabs.harvard.edu/abs/2007ApJS..168..213G Gnat & Sternberg (2007)]. 47 47 48 48 3b. Opacity is another key aspect of this problem. MESA has some subroutines that can derive opacity tables.