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

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 p...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2012-08, Vol.8 (S291), p.393-395
Main Authors: Hambaryan, V., Suleimanov, V., Neuhäuser, R., Werner, K.
Format: Article
Language:English
Subjects:
Contributed Papers
Magnetic fields
Neutrons
Physical properties
Red shift
Stars & galaxies
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Summary: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.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921312024258