The MARCS Model Atmosphere Construction Site
Note: This exercise is for advanced students.
The Marcs program, developed by B. Gustafsson, R. A. Bell, K.
Eriksson, and A. Nordlund (see Astronomy and Astrophysics 1975, 42,
407), computes plane-parallel, line-blanketed, flux constant stellar atmospheres
which also take into account the effects of convection.
The program
itself consists of several thousand lines of Fortran code.
In the form
below, specify the effective temperature, surface gravity, and overall chemical
composition of the atmosphere you are interested in. Note that the current
parameter space is restricted to 4000 < Teff < 7000K, 0.0< log g < 5.0, and metallicites (scaled
abundance of elements heavier than He relative to the Sun) of 10^0.0,
10^-1.0, 10^-2.0.
Output:
If you just go with the model output, you'll end up (after a few minutes) with a table that represents the physical charatceristics of your atmosphere. The columns are:
- Optical depth
- Temperature
- Log Pressure (gas)
- Log Pressure (electron)
- Mean molecular weight
- Opacity
The remaining columns identify the model based on the input parameters.
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