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The Gould's Belt Distances Survey

Published online by Cambridge University Press:  26 February 2013

Laurent Loinard
Laurent Loinard*
Affiliation:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3–72 (Xangari), 58089Morelia, Michoacán, Mexico email: l.loinard@crya.unam.mx
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Abstract

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Very Long Baseline Interferometry (VLBI) observations can provide the positions of compact radio sources with an accuracy of order 50 micro-arcseconds. This is sufficient to measure the trigonometric parallax and proper motions of any object within 500 pc of the Sun to better than a few percent. Because they are magnetically active, young stars are often associated with compact radio emission detectable using VLBI techniques. Here we show how VLBI observations have already constrained the distance to the most often studied nearby regions of star formation (Taurus, Ophiuchus, Orion, etc.) and have started to provide information about their internal structure and kinematics. We will then briefly describe a large project, the ‘Gould's Belt Distances Survey,’ which has been designed to provide a detailed view of star formation in the solar neighborhood using VLBI observations.

Keywords

astrometrystars: distancesstars: formationGalaxy: structuresolar neighborhoodradio continuum: stars

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