The strangeon star atmosphere (ssa) model describes the radiation from interstellar medium accreted plasma atmosphere on a strangeon star surface and its spectrum. The ssa could simply be regarded as the upper layer of a normal neutron star because the radiation from strangeon matter can be neglected (Wang et al. 2017, 1705.03763). The atmosphere is in radiative, thermal equilibrium and two-temperature. The ssa spectrum is based on bremsstrahlung from an extremely thin hydrogen plasma. More details of the ssa model are described in Wang et al. (2017, ApJ, 837, 81).
|par1||Te, the electron temperature (keV)|
|par2||y, , where is the ion number density on the stellar surface (cm), is the ion temperature (keV), and is the stellar radius (km). y is in units of keV/km/cm.|
|norm||, where is the distance to the star in units of 10 kpc.|