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We present CCD photometry of SX Phe variables in the field of the globularcluster M 55. We have discovered 27 variables, three of which are probablemembers of the Sagittarius dwarf galaxy. All of the SX Phe stars in M 55 lie inthe blue straggler region of the cluster color-magnitude diagram. Using periodratio information we have identified the radial pulsation modes for one of theobserved variables. Inspection of the period-luminosity distribution permitsthe probable identifications of the pulsation modes for most of the rest of thestars in the sample. We have determined the slope of the period-luminosityrelation for SX Phe stars in M 55 pulsating in the fundamental mode. Using thisrelation and the HIPPARCOS data for SX Phe itself, we have estimated theapparent distance modulus to M 55 to be (m-M)_V=13.86 +- 0.25 mag.Comment: A&A accepted, 11 figure

Cluster AgeS Experiment. CCD photometry of SX Phoenicis variables in the globular cluster M 55