Mass and Radius Determination for the Neutron Star in X-ray Burst Source 4U/MXB 1728-34

Details Mass and Radius Determination for the Neutron Star in X-ray Burst Source 4U/MXB 1728-34 Mass and Radius Determination for the Neutron Star in X-ray Burst Source 4U/MXB 1728-34

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aca....55..349m&link_type=abstract

Acta Astronomica, v.55, pp.349-366, (2005).

Astronomy and Astrophysics

Astronomy

5

Stars: Fundamental Parameters, Stars: Neutron, X-Rays: Bursts, Stars: Individual Mxb 1728-34

Scientific paper

We analyzed archival X-ray spectra of MXB 1728-34 obtained in 1996-99 by the Proportional Counter Array on board of the RXTE satellite. X-ray spectra were fitted to our extensive grids of model atmosphere spectra to determine the effective temperature T_eff on the neutron star surface, logarithm of surface gravity log g, and simultaneously the gravitational redshift z. We chose fitting of numerical model spectra plus broad Gaussian line, modified by interstellar absorption and the absorption on dust. We arbitrarily assumed either hydrogen-helium chemical composition of a model atmosphere, or H-He-Fe mixture in solar proportion. The statistically best values of log g, and z were subsequently used to determine mass and radius of the neutron star. We obtained the best values of parameters for the neutron star in X-ray burst source MXB 1728-34: mass either M=0.40 M_odot or 0.63 M_odot (for H-He or H-He-Fe models, respectively), radius R=4.6 km or 5.3 km, log g=14.6 or 14.6 and the gravitational redshift z=0.14 or 0.22. All the above parameters have very wide 1 sigma confidence limits. Their values strongly support the equation of state for strange matter in MXB 1728-34.

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