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X-ray properties of the stellar population in the Carina OB1 association areexamined with special emphasis on early-type stars. Their spectralcharacteristics provide some clues to understanding the nature of X-rayformation mechanisms in the winds of single and binary early-type stars. Atiming and spectral analysis of five observations with XMM-Newton is performedusing various statistical tests and thermal spectral models. 235 point sourceshave been detected within the field of view. Several of these sources areprobably pre-main sequence stars with characteristic short-term variability.Seven sources are possible background AGNs. Spectral analysis of twenty threesources of type OB and WR 25 was performed. We derived spectral parameters ofthe sources and their fluxes in three energy bands. Estimating the interstellarabsorption for every source and the distance to the nebula, we derived X-rayluminosities of these stars and compared them to their bolometric luminosities.We discuss possible reasons for the fact that, on average, the observed X-rayproperties of binary and single early type stars are not very different, andgive several possible explanations.

XMM-Newton X-ray study of early type stars in the Carina OB1 association