Recent progress

  1. Previously, we have this version of paper on the orbital period change in binary system with giant stars.

​paper

The referee asked us to show that our angular momentum evolution do not have serious problem. So I sampled the angular momentum through multiple of spherical shells in a single AGB star test in the co-rotating frame. Ideally, the angular momentum of the wind at any shell is the same, or not varying if we average of enough time. However, simulation has errors and sampling is never infinitely long.

​angular momentum error study

We should also replace the five images of alpha in the appendix in the last version of the paper.

​3au

​4au

​6au

​8au

​10au

We are going to use two figures to show the corrected orbital period change.

​exclude all angular momentum which measured at 0.8d in the AM error study

​only exclude the spin angular momentum of the AGB star

I am rewriting the paper.

  1. I studied the Riemann problem with realistic EOS.

​A study of EOS Riemann problem

The conclusion is, realistic gas behave somewhat like ideal gas with a smaller gamma, though not exactly the same. We can in the future run some simulation with gamma=1.1 instead of gamma=1.67.

I recommend to remodel the AGB wind and binary star model with this argument.

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