This model provides the
spectra in the X-ray range (0.05-10 keV) emitted from a hydrogen atmosphere of
a neutron star. There are three options : nonmagnetized (B < 108
- 109 G) with a uniform surface (effective) temperature in the range
of 
; a
field B = 1012 G with a uniform surface (effective) temperature in
the range of 
;
a field B = 1013 G with a uniform surface (effective) temperature in
the range of .
The atmosphere is in radiative and hydrostatic equilibrium; sources of heat are
well below the atmosphere. The Comptonization effects (significant at
) are
taken into account. The model spectra are provided as seen by a distant
observer, with allowance for the GR effects. The user is advised to keep Mns
and Rns fixed and fit the temperature and the normalization.
MagField must be fixed at one of 0, 1012, or 1013.
The values of the effective temperature and radius as measured by a distant observer (``values at infinity'') are :
where
is the gravitational redshift parameter.
Please send your comments/questions to Slava Zavlin (VYACHESLAV.ZAVLIN@msfc.nasa.gov) and/or George Pavlov (pavlov@astro.psu.edu). If you publish results obtained using these models, please reference Zavlin, V.E., Pavlov, G.G., & Shibanov, Yu.A. 1996, A&A, 315, 141 for nonmagnetic models, and Pavlov, G.G., Shibanov, Yu.A., Zavlin, V.E., & Meyer, R.D. 1995, in “The Lives of the Neutron Stars,” ed. M.A. Alpar, U. Kiziloglu, & J. van Paradijs (NATO ASI Ser. C, 450; Dordrecht: Kluwer), p. 71 for magnetic models.
|
par1 |
logTeff, (unredshifted) effective temperature |
|
par2 |
Mns, neutron star gravitational mass (in units of solar mass) |
|
par3 |
Rns, neutron star radius (in km) |
|
par4 |
neutron star magnetic field strength (0, 1e12, or 1e13 G) |
|
K |
1/D2, where D is the distance of the object in pc. |