Abstract
The r-mode instability window of low-mass strange stars is studied using the modified bag model of strange quark matter and reasonable sets of parameters. The results show that the ultimate spin frequency of strange stars increases with the decreasing stellar mass, and the highest spin frequency (716Hz) of pulsars observed sofar can be explained by the bare strange stars with a mass lower than about 0.1∼0.2M⊙, depending on the selected parameters.
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