Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-02-19
2010 ApJ 719 1807
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
accepted for publication in The Astrophysical Journal
Scientific paper
10.1088/0004-637X/719/2/1807
We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 +/- 0.06 M_sun and the radius to be R = 9.11 +/- 0.40 km.
Camarota Larry
Guver Tolga
Ozel Feryal
Wroblewski Patricia
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