Coherent oscillations from X-ray burst sources

The possible origin or coherent oscillations in X-ray bursters is discussed. Such oscillations with a period of the order of 10 ms have recently been observed. At this point it seems impossible to draw final conclusions on their nature. Nevertheless, it is shown that nonradial pulsations of a neutron star or torsional oscillations of a neutron star's crust seem to be an attractive possibility.