L. H. Quiroga-Nuñez, H. J. van Langevelde, M. J. Reid, L. O. Sjouwerman, Y. M. Pihlström, A. G. A. Brown, J. A. Green
Using the VLBA, the BeSSeL survey has provided distances and proper motions of young massive stars, allowing an accurate measure of the Galactic spiral structure. By the same technique, we are planning to map the inner Galaxy using positions and velocities of evolved stars (provided by the BAaDE survey). These radio astrometric measurements (BeSSeL and BAaDE) will be complementary to Gaia results and the overlap will provide important clues on the intrinsic properties and population distribution of the stars …
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