A grid of MARCS model atmospheres for late-type stars I. Methods and general properties

Understand

We have constructed a grid of about 10,000 spherically symmetric and plane-parallel models with the MARCS program, and make it available for public use.

• Parameter ranges are: Teff=2500 to 8000 K, log g =log(GM/R2)= -1 to 5 (cgs) with various masses and radii, [Me/H]=-5 to +1, with [Alpha/Fe] = 0.0 and 0.4 and different choices of C and N abundances to also represent stars of types R, S and N, and with microturbulence parameters from 1 to 5 km/s.
• We also list fluxes in approximately 108,000 wavelength points.
• Underlying assumptions in addition to 1D stratification include hydrostatic equilibrium, MLT convection and LTE.