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We report on the main results obtained thanks to an observation campaign withXMM-Newton of four persistent, low-luminosity (Lx ~ 10^34 erg/s) andlong-period (P > 200 s) Be accreting pulsars. We found that all sourcesconsidered here are characterized by a spectral excess that can be describedwith a blackbody component of high temperature (kTbb > 1 keV) and small area(Rbb < 0.5 km). We show that: 1) this feature is a common property of severallow-luminosity X-ray binaries; 2) for most sources the blackbody parameters(radius and temperature) are within a narrow range of values; 3) it can beinterpreted as emission from the NS polar caps.

The hot-blackbody spectral excess in low-luminosity High-Mass X-Ray Binaries