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We present the first Swift/XRT long-term monitoring of 2S 0114+650, awind-fed supergiant X-ray binary for which both orbital and superorbitalperiods are known (P_orb~11.6d and P_sup~0.8d). Our campaign, summing up to ~79ks, is the most intense and complete sampling of the X-ray light curve ofthis source with a sensitive pointed X-ray instrument, and covers 17 orbital,and 6 superorbital cycles. The combination of flexibility, sensitivity, andsoft X-ray coverage of XRT allowed us to confirm previously reported spectralchanges along the orbital cycle of the source and unveil the variability in itsspectral parameters as a function of the superorbital phase. For completeness,we also report on a similar analysis carried out by exploiting XRT archivaldata on three additional wind-fed supergiant X-ray binaries IGR J16418-4532,IGR J16479-4514, and IGR J16493-4348. For these sources, the archival dataprovided coverage along several superorbital cycles but our analysis could notreveal any significant spectral variability.

Swift/XRT observations of superorbital modulations in wind-fed supergiant X-ray binaries