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The spectral and magnetic properties and variability of the B2Vnpemission-line magnetosphere star HR7355 were analyzed. The object rotates atalmost 90% of the critical value, meaning it is a magnetic star for whichoblateness and gravity darkening effects cannot be ignored any longer. Adetailed modeling of the photospheric parameters indicate that the star issignificantly cooler than suggested by the B2 spectral type, with T_eff=17500Katypically cool for a star with a helium enriched surface. The spectroscopicvariability of helium and metal lines due to the photospheric abundance patternis far more complex than a largely dipolar, oblique magnetic field of about 11to 12kG may suggest. Doppler imaging shows that globally the most He enrichedareas coincide with the magnetic poles and metal enriched areas with themagnetic equator. While most of the stellar surface is helium enriched withrespect to the solar value, some isolated patches are depleted. The stellarwind in the circumstellar environment is governed by the magnetic field, i.e.the stellar magnetosphere is rigidly corotating with the star. Themagnetosphere of HR7355 is similar to the well known \sigma Ori E: the gastrapped in the magnetospheric clouds is fairly dense, and at the limit to beingoptically thick in the hydrogen emission. Apart from a different magneticobliquity, HR7355 and the more recently identified HR5907 have virtuallyidentical stellar and magnetic parameters.

Basic parameters and properties of the rapidly rotating magnetic helium strong B star HR7355