New Mass and Radius Constraints for the Ms X-ray Pulsar SAX J1808.4-3658

Details New Mass and Radius Constraints for the Ms X-ray Pulsar SAX J1808.4-3658 New Mass and Radius Constraints for the Ms X-ray Pulsar SAX J1808.4-3658

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3508l&link_type=abstract

American Astronomical Society Meeting 210, #35.08; Bulletin of the American Astronomical Society, Vol. 39, p.149

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The x-ray pulse shapes of SAX J1808.4-3658 obtained during its 1998 and 2002 outbursts are analyzed. The analysis method was developed to include several physical phenomena relevant to rapidly spinning neutron stars: doppler effects due to the high surface velocity; time delays due to geometry and due to general relativity; light bending; and the oblateness of the neutron star due to its rapid spin. The approximations used to facilitate computations needed for modeling the pulse shapes were verified using a fully general-relativistic code. The results of the modeling yield an allowed area in the mass-radius plane. At the 95% confidence level, this area is approximately an ellipse with 9kmThis work supported by the Natural Sciences and Engineering Research Council of Canada.

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