The Synergy between VLBI and Gaia astrometry
Paper in 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

Galaxies

Author

H. J. van Langevelde

Leiden University

Joint Institute for VLBI in Europe (JIVE)

L.H. Quiroga-Nuñez

Leiden University

Wouter Vlemmings

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Other publications Research

L. Loinard

Universidad Nacional Autónoma de México

Mareki Honma

National Astronomical Observatory of Japan

A. Nakagawa

Kagoshima University

K. Immer

Joint Institute for VLBI in Europe (JIVE)

R. A. Burns

National Astronomical Observatory of Japan

Korea Astronomy and Space Science Institute

Joint Institute for VLBI in Europe (JIVE)

Y. Pihlstrom

University of New Mexico

Loránt Olivér Sjouwerman

National Radio Astronomy Observatory

R. Michael Rich

University of California

Iniyan Natarajan

Rhodes University

R. P. Deane

University of Pretoria

Rhodes University

Proceedings of Science

18248039 (eISSN)

Vol. 344

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

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

Other Physics Topics

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8/22/2025

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