The distance and internal composition of the neutron star in EXO 0748-676 with XMM-Newton

Details The distance and internal composition of the neutron star in EXO 0748-676 with XMM-Newton The distance and internal composition of the neutron star in EXO 0748-676 with XMM-Newton

2010-07-05

arxiv.org/abs/1007.0647v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 7 figures, 2 tables, submitted to MNRAS on June 20, 1010

Scientific paper

Recently, the neutron star X-ray binary EXO 0748-676 underwent a transition to quiescence. We analyzed an XMM-Newton observation of this source in quiescence, where we fitted the spectrum with two different neutron-star atmosphere models. From the fits we constrained the allowed parameter space in the mass-radius diagram for this source for an assumed range of distances to the system. Comparing the results with different neutron-star equations of state, we constrained the distance to EXO 0748-676. We found that the EOS model 'SQM1' is rejected by the atmosphere model fits for the known distance, and the 'AP3' and 'MS1' is fully consistent with the known distance.

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