POSITIONS OF THE RADIO RECOMBINATION LINE MASERS IN MWC-349

The Owens Valley Millimeter Interferometer has been used at 232 GHz to measure the relative positions of the strongest H30-alpha-maser features toward MWC 349. Maser emission appears to originate from two positions 0.065" +/- 0.005" (80 AU) apart, located in an almost east-west direction (P.A. 107-degrees +/- 7-degrees), approximately perpendicular to the bipolar ionized wind structure observed in low-frequency radio continuum maps. We argue that the maser features originate in two positions associated with a nearly edge-on, neutral disk which is the source of high-density ionized gas. The maser spots probably arise from clumps located in the near part of the disk surface.