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We perform a survey of Oe and Be stars in the X-ray range. To this aim, wecross-correlated XMM-Newton and Chandra catalogs of X-ray sources with a listof Be stars, finding 84 matches in total. Of these, 51 objects had enoughcounts for a spectral analysis. This paper provides the derived X-rayproperties (X-ray luminosities, and whenever possible, hardness ratios, plasmatemperatures, and variability assessment) of this largest ever sample of Oe andBe stars. The targets display a wide range in luminosity and hardness. Inparticular, the significant presence of very bright and hard sources isatypical for X-ray surveys of OB stars. Several types of sources areidentified. A subset of stars display the typical characteristics of O-stars,magnetic OB stars, or pre-main-sequence (PMS) objects: their Be nature does notseem to play an important role. However, another subset comprises gamma Casanalogs, which are responsible for the luminous and hard detections. Our samplecontains seven known gamma Cas analogs, but we also identify eight new gammaCas analogs and one gamma Cas candidate. This nearly doubles the sample of suchstars.

Hot stars observed by XMM-Newton II. A survey of Oe and Be stars