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We used high-spatial resolution images acquired with the WFC3 on board HST toprobe the population of variable blue straggler stars in the central region ofthe poorly studied Galactic globular cluster NGC 6541. The time sampling of theacquired multi wavelength (F390W, F555W and F814W) data allowed us to discoverthree WUma stars and nine SX Phoenicis. Periods, mean magnitudes and pulsationmodes have been derived for the nine SX Phoenicis and their masses have beenestimated by using pulsation equations obtained from linear non adiabaticmodels. We found masses in the range 1.0-1.1Mo, with an average value of1.06+-0.09 Mo (sigma = 0.04), significantly in excess of the cluster MainSequence Turn Off mass (~ 0.75Mo). A mild trend between mass and luminosityseems also to be present. The computed pulsation masses turn out to be in verygood agreement with the predictions of evolutionary tracks for single stars,indicating values in the range ~ 1.0-1.2 Mo for most of the BSS population, inagreement with what discussed in a number of previous studies.

Blue Straggler masses from pulsation properties. I. The case of NGC6541