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We present bispectrum speckle interferometry of the massive protostellarobject IRAS 23151+5912 in the near-infrared K' band. The reconstructed imageshows the diffuse nebulosity north-east of two point-like sources inunprecedented detail. The comparison of our near-infrared image with mmcontinuum and CO molecular line maps shows that the brighter of the two pointsources lies near the center of the mm peak, indicating that it is a high-massprotostar. The nebulosity coincides with the blue-shifted molecular outflowcomponent. The most prominent feature in the nebulosity is a bow-shock-likearc. We assume that this feature is associated with a precessing jet which hascreated an inward-pointed cone in the swept-up material. We present numericaljet simulations that reproduce this and several other features observed in ourspeckle image of the nebulosity. Our data also reveal a linear structureconnecting the central point source to the extended diffuse nebulosity. Thisfeature may represent the innermost part of a jet that drives the strongmolecular outflow (PA ~80 degr) from IRAS 23151+5912. With the aid of radiativetransfer calculations, we demonstrate that, in general, the observed innerstructures of the circumstellar material surrounding high-mass stars arestrongly influenced by the orientation and symmetry of the bipolar cavity.

Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912