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Preprint 11a/10

Model atmospheres of X-ray bursting neutron stars

V. Suleimanov (1,2), J. Poutanen (3), M. Revnivtsev (4) and K. Werner (1)

1) Insitute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard
Karls University, Sand 1, 72076 Tübingen, Germany
2) Kazan Federal University, Kremlevskaya str. 18, 42008 Kazan, Russia
3) Astronomy Division, PO Box 3000, FIN-90014 University of Oulu, Finland
4) Space Research Institute, Profsoyuznaya str. 84/32, 117997 Moscow, Russia

To be published in: Conference proceedings "Astrophysics of Neutron Stars - 2010"

Abstract. We present an extended set of model atmospheres and emergent spectra of X-ray bursting neutron stars in low mass X-ray binaries. Compton scattering is taken into account. The models were computed in LTE approximation for six different chemical compositions: pure hydrogen and pure helium atmospheres, and atmospheres with a solar mix of hydrogen and helium and various heavy elements abundances: Z = 1, 0.3, 0.1, and 0.01 Z_sun, for three values of gravity, log g =14.0, 14.3, and 14.6 and for 20 values of relative luminosity l = L/L_Edd in the range 0.001 - 0.98. The emergent spectra of all models are fitted by diluted blackbody spectra in the observed RXTE/PCA band 3 - 20 keV and the corresponding values of color correction factors f_c are presented. We also show how to use these dependencies to estimate the neutron star's basic parameters.

Astrophysics (astro-ph): 1010.0151

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