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Detailed modeling of the millisecond brightness oscillations duringthermonuclear bursts from low mass X-ray binaries can provide importantinformation about neutron star structure. Until now the implementation of thisidea has not been entirely successful, largely because of the negligibleharmonic content in burst oscillation lightcurves. However, the recentdiscovery of non-sinusoidal burst oscillation lightcurves from the accretingmillisecond pulsar XTE J1814-338 has changed this situation. We, therefore, forthe first time, make use of this opportunity to constrain neutron starparameters. In our detailed study of the lightcurves of 22 bursts, we fit theburst oscillation lightcurves with fully general relativistic models thatinclude light-bending and frame-dragging for lightcurve calculation, andcompute numerically the structure of neutron stars using realistic equations ofstate. We find that for our model and parameter grid values, at the 90%confidence level, Rc^2/GM > 4.2 for the neutron star in XTE J1814-338. We alsofind that the photons from the thermonuclear flash come out through the layersof accreted matter under conditions consistent with Thomson scattering, andshow that the secondary companion is a hydrogen burning main sequence star,with possible bloating (probably due to X-ray heating).Comment: 32 pages, 14 figures, 4 tables, thorough revision, accepted for  publication in Ap

Constraints on Neutron Star Parameters from Burst Oscillation Light Curves of the Accreting Millisecond Pulsar XTE J1814−338