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Published September 11, 2022 | Version v1
Presentation Open

VLBI stellar astrometry in the era of Gaia: Star-formation and binaries

  • 1. Instituto de Radioastronomía y Astrofísica UNAM - Campus Morelia

Description

Phased-referenced VLBI astrometry can yields astrometric accuracies, and trigonometric parallax measurements, with an accuracy comparable with the Gaia satellite (of order 10-50 mu-as). This capability has been used in the last two decades to measure the distance to highly obscured objects such as masers across the galactic disk or young stars embedded in two parental cloud. In this talk, I will summarized the results of a large VLBA survey called GOBELINS that measured the distance to about one hundred young stars within a few hundred parsecs of the Sun and will discuss how these results compare to Gaia's. I will emphasize the advantages of the VLBI technique over ground and space-based techniques in the study of binary stars (for instance, the possibility of resolving binaries separeted by a mere few mas and of accurately measuring the masses of individual components in such systems). Finally, I will discuss the prospects of VLBI astrometry for the coming few decades.

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IAU2022_FM7_Loinard.pdf

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