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Constraints of the compactness of the isolated neutron stars via X-ray phase-resolved spectroscopy

Published online by Cambridge University Press:  20 March 2013

V. Hambaryan ,
V. Suleimanov ,
R. Neuhäuser  and
K. Werner
V. Hambaryan
Affiliation:
Friedrich-Schiller-Universität, Astrophysikalisches Institut und Universitäts-Sternwarte, 07745 Jena, Germany, email: valeri.Hambaryan@uni-jen.de
V. Suleimanov
Affiliation:
Eberhard-Karls-Universität, Institut für Astronomie und Astrophysik, 72076 Tübingen, Germany
R. Neuhäuser
Affiliation:
Friedrich-Schiller-Universität, Astrophysikalisches Institut und Universitäts-Sternwarte, 07745 Jena, Germany, email: valeri.Hambaryan@uni-jen.de
K. Werner
Affiliation:
Eberhard-Karls-Universität, Institut für Astronomie und Astrophysik, 72076 Tübingen, Germany
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Abstract

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A model with a condensed iron surface and partially ionized hydrogen-thin atmosphere allows us to fit simultaneously the observed general spectral shape and the broad absorption feature (observed at 0.3 keV) in different spin phases of the isolated neutron star RBS 1223. We constrain some physical properties of the X-ray emitting areas, i.e. the temperatures (Tpole1 ~ 105 eV, Tpole2 ~ 99 eV), magnetic field strengths (Bpole1 ≈ Bpole2 ~ 8.6 × 1013 G) at the poles, and their distribution parameters (a1 ~ 0.61, a2 ~ 0.29, indicating an absence of strong toroidal magnetic field component). In addition, we are able to place some constraints on the geometry of the emerging X-ray emission and the gravitational redshift (z ~ 0.160.03−0.01) of the isolated neutron star RBS 1223.

Keywords

stars: neutronX-rays: starstechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 393 - 395
Copyright
Copyright © International Astronomical Union 2013

References

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