  The accuracy of measuring the basic parameters of neutron stars is limited in
particular by uncertainties in chemical composition of their atmospheres. For
example, atmospheres of thermally - emitting neutron stars in supernova
remnants might have exotic chemical compositions, and for one of them, the
neutron star in CasA, a pure carbon atmosphere has recently been suggested by
Ho & Heinke (2009). To test such a composition for other similar sources, a
publicly available detailed grid of carbon model atmosphere spectra is needed.
We have computed such a grid using the standard LTE approximation and assuming
that the magnetic field does not exceed 10^8 G. The opacities and pressure
ionization effects are calculated using the Opacity Project approach. We
describe the properties of our models and investigate the impact of the adopted
assumptions and approximations on the emergent spectra.
