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Gravitationally redshifted absorption lines from highly ionized iron havebeen previously identified in the burst spectra of the neutron star in EXO0748-676. To repeat this detection we obtained a long, nearly 600 ksobservation of the source with XMM-Newton in 2003. The spectral features seenin the burst spectra from the initial data are not reproduced in the burstspectra from this new data. In this paper we present the spectra from the 2003observations and discuss the sensitivity of the absorption structure to changesin the photospheric conditions.

The Burst Spectra of EXO 0748-676 during a Long 2003 XMM-Newton Observation