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The majority of X-ray burst sources do not display a burst rate thatincreases with luminosity as expected, but this is seen in the two clockedbursters XB1323-619 and GS1826-24. We present a detailed investigation of thesetwo sources which in the case of the first source, spans 18 years. Based onmeasurements of the burst rate, X-ray luminosity, the alpha-parameter and thetwo time constants generally present in the burst decays, we demonstrate theimportance of the rp nuclear burning process. A detailed comparison with theoryshows that although the burst rate in each source agrees well with thetheoretical value, there is a difference of more than a factor of 5 in theburst rate at a given luminosity between the sources. We show that the mainreason for this is that the two sources have substantially different emittingareas on the neutron star in non-burst emission, a factor often neglected.Variation of this area may explain the inverse relation of burst rate withluminosity in the majority of burst sources.

The periodic bursters XB1323-619 and GS1826-24: longterm evolution of the nuclear burning regime and comparison with theory