2457 20160701171705.0 ASTROimport-614 Rauw, G. 2001 An XMM-Newton Study of 9SGR and the Lagoon Nebula We report preliminary results of an XMM-Newton observation of the 04 V star 9 Sgr (= HD 164794). 9 Sgr is one of a few single OB stars that display a non-thermal radio emission attributed to synchrotron emission by relativistic electrons. Inverse Compton scattering of photospheric UV photons by these relativistic electrons is a priori expected to generate a non-thermal power-law tail in the X-ray spectrum. Our EPIC and RGS spectra of 9 Sgr suggest a more complex situation than expected from this 'simple' theoretical picture. Furthermore, soft-band EPIC images of the region around 9 Sgr reveal a number of point sources inside the Lagoon Nebula (M8). Most of these sources have optical counterparts inside the very young open cluster NGC 6530 and several X-ray sources are associated with low and intermediate mass pre-main sequence stars. Finally, we also detect (probably) diffuse X-ray emission from the Hourglass Region that might reveal a hot bubble blown by the stellar wind of Herschel 36, the ionizing star of the HG region. Blomme, R. Waldron, W. L. Naze, Y. Harries, T. J. Chapman, J. M. Corcoran, M. F. Detal, A. Gosset, E. Pittard, J. M. Pollock, A. M. T. Runacres, M. C. Sana, H. Stevens, I. R. Van Loo, S. Vreux, J. M. NASA STI/Recon Technical Report N 2 2001 http://esoads.eso.org/abs/2001STIN...0247005R published in NONREF