A Study of Hydrogen Recombination Masers in MWC349A

Using the Submillimeter Array we performed subarcsecond resolution observations of H26α and H30α recombination lines in MWC349A in order to map the distribution of this emission as many distinct maser spots. The high signal-to-noise ratio of the maser emission allows us to constrain the position of the maser spots to milliarcsecond precision at a maximum velocity resolution of 0.53 km/s. We confirm previous observations showing that the majority of the maser spots are located in a strip thought to trace out the disk of gas surrounding the star. We then use this data to compare the positions of H26α and H30α maser spots and to analyze the structure of the disk of gas around MWC349A