J/AcA/41/73 Model atmospheres of X-ray bursting neutron stars (Madej, 1991)
Tables of model atmospheres of bursting neutron stars.
Madej J.
<Acta Astron., 41, 73-99 (1991)>
=1991AcA....41...73M 1991AcA....41...73M
ADC_Keywords: Models, atmosphere ; Binaries, X-ray
Keywords: stars: atmospheres - stars: neutron
Abstract:
X-ray burst sources represent a class of accreting neutron stars in
close binary systems which do not exhibit any traces of the magnetic
field. We present the first detailed tables which show the structure
of plane--parallel hydrogen-helium atmospheres of bursting neutron
stars. Hydrogen-helium models were computed with precise
angle-dependent radiative transfer under constrains of radiative and
hydrostatic equilibrium. Compton scattering opacity included both the
Klein-Nishina corrections and the effects of relativistic Maxwellian
thermal motion of scattering electrons. Compton redistribution
function allows for large energy exchange between X-ray photons and
scattering electrons.
Description:
Grid consists of 20 plane-parallel model atmospheres of the single
hydrogen-helium chemical composition with the helium number abundance
He/H=0.11 (solar value). Total of 20 model atmospheres were computed
for the effective temperatures Teff=8x10^6, 1.257x10^7, 2x10^7 and
3x10^7K and various surface gravities logg=12.5 to 15.0 (g in units
cm/s2).
Model atmospheres present tables of Thomson scattering optical depth,
temperature, gas pressure, radiative acceleration, electron number
density, density of gas, Rosseland optical depth and geometrical depth
(in cgs units).
Values of effective temperatures Teff, gravities logg and all
physical variables are measured on the neutron star surface.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 23 20 Model parameters
table1.dat 83 856 *Run of physical variables
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Note on table1.dat: structure of 20 models of neutron star atmospheres.
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- nr [1/20] Model number
7- 15 E9.4 K Teff Effective temperature
(8.00E+06, 1.257E+07, 2.00E+07, 3.00E+07)
20- 23 F4.1 [cm/s2] logg [12.5/15] Logarithm of surface gravity
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- nr [1/20] Model number
4- 13 E10.4 --- tau-std Standard optical depth τ
15- 23 E9.3 K Temp Temperature (1)
25- 33 E9.3 dPa Pg Gas pressure, in dyn/cm2 (1)
35- 43 E9.3 cm/s2 acc Radiative acceleration (1)
45- 53 E9.3 cm-3 ne Electron concentration (1)
55- 63 E9.3 g/cm3 rho Gas density ρ (1)
65- 73 E9.3 --- tau-Ross Rosseland optical depth τRoss
75- 83 F9.2 cm Height [-36000/15200] geometrical height (1)
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Note (1): Quantities are given in cgs units.
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Acknowledgements:
Jerzy Madej, jm(at)astrouw.edu.pl, University of Warsaw
References:
Madej, 1991ApJ...376..161M 1991ApJ...376..161M,
Model atmospheres and X-ray spectra of bursting neutron stars
(End) J. Madej, A. Majczyna, M. Nalezyty [Warsaw], P. Vannier [CDS] 18-Nov-2014