4 July 2017
Europe/Berlin timezone
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MPIfR - 0.02

Astrometric maser measurements compared with GAIA



Primary authors


Using Very Long Base Interferometry (VLBI), the Bar and Spiral Legacy (BeSSeL) survey has provided distances and proper motions for maser-bearing young massive stars (Reid et al. 2009,2014), allowing an accurate measure of the spiral Galactic structure and kinematics. By the same technique, we are planning to map the inner Galaxy and bulge using positions and velocities of SiO masers stars (Bulge Asymmetries and Dynamical Evolution - BAaDE survey: Sjouwerman et al. 2015) wich are expected to be associate with evolved, mass-loosing stars. These radio astrometric measurements (BeSSeL and BAaDE) will be complementary to Gaia results since, at optical wavelengths, the inner plane of the Galaxy will be obscured. The overlap between optical and radio surveys provides important clues on the intrinsic properties and population distribution of evolved stars. Moreover, using radio observations on different targets: young massive stars (BeSSeL) and AGB stars (BAaDE), we expect to make a fundamental comparison of Galactic parameters obtained with Gaia and VLBI.