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The X-ray under-luminosity of the O-type supergiants HD 16691 and HD 14947 revealed by XMM-Newton

De Becker, M.

The members of the scarce category of Of⁺ supergiants present properties that are intermediate between regular O-stars and Wolf-Rayet (WR) stars. Significant similarities between these transitional stars and WN-type objects are now clearly established, at least in the visible and near-infrared domains, pointing to common stellar wind pr…

An XMM-Newton view of the M 17 nebula

Mernier, F.; Rauw, G.

We present the analysis of an XMM-Newton observation of the M 17 nebula. The X-ray point source population consists of massive O-type stars and a population of probable low-mass pre-main sequence stars. CEN 1a,b and OI 352, the X-ray brightest O-type stars in M 17, display hard spectra (kT of 3.8 and 2.6 keV) consistent with a colliding wind origi…