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We present a numerical model describing a circularly symmetric gaseous diskaround the Be star chi Ophiuchi. The model is constrained by long-baselineinterferometric observations that are sensitive to the H-alpha Balmer lineemission from the disk. For the first time our interferometric observationsspatially resolve the inner region of the circumstellar disk around chiOphiuchi and we use these results to place a constraint on the physical extentof the H-alpha-emitting region. We demonstrate how this in turn results in veryspecific constraints on the parameters that describe the variation of the gasdensity as a function of radial distance from the central star.

Constraining the Physical Parameters of the Circumstellar Disk of chi Ophiuchi