Modeling of the High-velocity Jet Powered by the Massive Star MWC 349A

Abstract MWC 349A is a massive star with well-known circumstellar disk rotating following Keplerian law, and an ionized wind launched from the surface. Recent observations Atacama Large Millimeter/submillimeter Array (ALMA) carried out toward this system, however, have revealed additional high-velocity component in strong, maser emission of hydrogen radio recombination lines (RRLs), suggesting presence jet. In work, we present 3D non-LTE radiative transfer modeling H30 α H26 lines, their associated continuum emission, 349A. By using MORELI code, reproduce spatial distribution kinematics jet expanding at velocity ∼250 km s −1 , surrounded by 349A’s wide-angle wind. The bipolar jet, which disk, poorly collimated slightly misaligned respect to rotation axis. Thanks unprecedented sensitivity accuracy provided ALMA, also find that already known, decelerates as it expands radially disk. We briefly discuss implications our findings for understanding formation evolution stars. Our results show huge potential RRL masers powerful probes innermost regions around stars jets.