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High-resolution data of the peculiar magnetic massive star HD148937 wereobtained with Chandra-HETGS, and are presented here in combination with are-analysis of the older XMM-RGS data. The lines of the high-Z elements (Mg,Si, S) were found to be unshifted and relatively narrow (FWHM of about800km/s), i.e. narrower than the O line recorded by RGS, which possiblyindicates that the hot plasma is multi-thermal and has several origins. Thesedata further indicate a main plasma temperature of about 0.6keV and a formationof the X-ray emission at about one stellar radius above the photosphere. Fromthe spectral fits and the H-to-He line ratios, the presence of very hot plasmais however confirmed, though with a smaller relative strength than for theprototype magnetic oblique rotator $\theta^1$\,Ori\,C. Both stars thus sharemany similarities, but HD148937 appears less extreme than $\theta^1$\,Ori\,Cdespite having also a large magnetic confinement parameter.

High-resolution X-ray spectroscopy of the magnetic Of?p star HD148937