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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; A&A, submitted).

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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