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##

carbatm: Nonmagnetic carbon atmosphere of a neutron star

The model provides the spectra emitted from a nonmagnetic carbon
atmosphere of a neutron star. The model spectra in a 0 - 20 keV range
of (unredshifted) photon energy are computed on a grid of surface
gravity accelerations log(g) = 13.7 - 14.9 (in cgs units) and
effective temperatures T = 1 - 4 MK. For a given set of the fitting
parameters, the surface gravity g and the gravitational redshift z are
derived from the mass M and radius R of the star. The trial spectra
are computed using a linear interpolation between the nearest model
spectra on the T-log(g) grid, and the boundaries of the energy
bins. The number of photons in each bin are divided by (1+z). This is
an updated version of the models presented in
Suleimanov et
al. (2014). The
details can be found in Suleimanov et al. (2016).

The directory used for the files required by this model can be changed
by using the xset command to set CARBATM.

The parameters are:

par1 |
Effective temperature T (MK) |

par2 |
Neutron star mass M (M) |

par3 |
Neutron star radius R (km) |

par4 |
Normalization K = A/(dkpc) where dkpc is the distance to the source in units of 10 kpc and A characterizes the fraction of the surface emitting the radiation (A=1 corresponds to the case when the radiation is emitted from the entire surface). |

Please send any questions and comments about this model to
suleimanov@astro.uni-tuebingen.de or
klochkov@astro.uni-tuebingen.de.

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