The Synergy between VLBI and Gaia astrometry
Paper i proceeding, 2018

With the publication of Gaia DR2, 1.3 billion stars now have public parallax and proper motion measurements. In this contribution, we compare the results for sources that have both optical and radio measurements, focusing on circumstellar masers. For these large, variable and bright AGB stars, the VLBI astrometry results can be more robust. Moreover, there are a number of applications where VLBI astrometry provides unique data for studying stellar populations and Galactic structure. The BeSSel project not only provides parallax and proper motions at much larger distances than Gaia can reach, but it also uniquely samples the spiral arms of the Galaxy. The evolved stars in the BAaDE sample can potentially constrain the dynamics and stellar content of the inner bulge and bar of the Milky Way, not reachable in the optical.


Geometrical optics


H. J. van Langevelde

Universiteit Leiden

Joint Institute for VLBI in Europe (JIVE)

L.H. Quiroga-Nuñez

Universiteit Leiden

Wouter Vlemmings

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

L. Loinard

Universidad Nacional Autonoma de Mexico

Mareki Honma

National Astronomical Observatory of Japan

A. Nakagawa

Kagoshima University

K. Immer

Joint Institute for VLBI in Europe (JIVE)

R. A. Burns

Joint Institute for VLBI in Europe (JIVE)

Korea Astronomy and Space Science Institute

National Astronomical Observatory of Japan

Y. Pihlstrom

University of New Mexico

Loránt Olivér Sjouwerman

National Radio Astronomy Observatory Socorro

R. Michael Rich

University of California

Iniyan Natarajan

Rhodes University

R. P. Deane

Rhodes University

Universiteit van Pretoria

Proceedings of Science

18248039 (eISSN)

Vol. 344

14th European VLBI Network Symposium and Users Meeting, EVN 2018
Granada, Spain,


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik

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