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        A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry

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        Author
        Dzib, Sergio A.
        Forbrich, Jan
        Reid, Mark J.
        Menten, Karl M.
        Attention
        2299/23773
        Abstract
        From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources in the Gaia DR2 catalog for 34 of them within 0.2" of the radio positions. Most of the radio sources are likely companions of Gaia detections. However, there are 11 stars whose VLBA position differs from Gaia by <1.6 mas, and some of these radio sources probably are the direct counterparts of the optical stars. We are able to obtain radio proper motions for 23 stars. Combining the stellar proper motions derived from the VLBA and Gaia data we find the global motion and velocity dispersion of the ONC to be (mu_alpha*, mu_delta) = (1.20 +/- 0.09, 0.18 +/- 0.09) mas/yr and (sigma_mu_alpha*, sigma_mu_delta) = (0.84 +/-0.09, 1.30 +/-0.09) mas/yr. Finally, we looked for ordered motions by estimating the means of scalar and vectorial products, which results in vr = -0.61 +/- 1.00 km/s and vxr = 0.57 +/- 0.95 km/s. These do not show indications that the young stellar cluster is in expansion, contraction, or rotation.
        Publication date
        2021-01-04
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/abc68f
        License
        Other
        Other links
        http://hdl.handle.net/2299/23773
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        School of Physics, Engineering & Computer Science
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