TYCHO: Getting Started

Running tycho6.9

• TYCHO has on-line graphics using PGPLOT, which is used by subroutines pgplot.f, cvplt.f, hrplt.f, and dbplt. After unpacking the tycho-6.9 tarfile,

  cd tycho-6.9
  src/check_config 
  

  in the tycho-6.9 directory. This shell script will check to see if your machine has the software needed. Example

• See the PGPLOT setup page for detailed instructions for testing your machine for an already installed PGPLOT, and for obtaining and installing PGPLOT if necessary.

• After testing PGPLOT, go to the subdirectory tycho-6.9/src

  cd src 
  make all
  

  to start compilation of the suite of TYCHO programs.

• If successful, go back to the root TYCHO directory

  cd ..
  tycho6

  and tycho should start, taking parameters from the file params.d, reading in an initial model from the file imodel, and getting data for equation of state, opacities, and reaction rates as needed.
• Tycho should bring up 3 PGPLOT windows, evolve the model (a 6 solar mass star just born on the Hayashi track) for 5 time steps.
If all went well, you will have run tycho6 briefly.

To continue the run:

Edit the file /tycho-6.9/params.d to change the number of time steps line to

' Number of timesteps for this run...........' 'll'      1000

for a long run. This should take the model well beyond the main sequence.

Understanding the on-line graphics windows.

TYCHO-6.9 uses both on-line graphics and off-line graphics. The on-line graphics are shown in three PGPLOT xwindows described below. Several auxillary programs provide windows or postscript files for analysis and hardcopy (see /tycho-6.9/README).

• The HR diagram.
• The convective structure.
• The composite Iben plot.

A longer run

• Edit the file /tycho-6.9/params.d to change the number of time steps line to

  ' Number of timesteps for this run...........' 'll'        700
  

• To run the code, type

   tycho6 

These 700 steps took 36 minutes on a desktop with a 2.4GHz Pentium 4 cpu, and 18 minutes on an AMD Athlon 64 3700+ laptop.

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E-mail:darnett@as.arizona.edu


Legalese:

TYCHO is not public domain software, but is freely available for non-commercial purposes. Absolutely no guarantee is given; use at your own risk...

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