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

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A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry. / Dzib, Sergio A.; Forbrich, Jan; Reid, Mark J.; Menten, Karl M.

In: The Astrophysical Journal, Vol. 906, No. 1, 24, 04.01.2021.

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Dzib, Sergio A. ; Forbrich, Jan ; Reid, Mark J. ; Menten, Karl M. / A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry. In: The Astrophysical Journal. 2021 ; Vol. 906, No. 1.

Bibtex

@article{482fb4a42c2f47ab8b084e817f232bb1,
title = "A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry",
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. ",
keywords = "astro-ph.SR, astro-ph.GA",
author = "Dzib, {Sergio A.} and Jan Forbrich and Reid, {Mark J.} and Menten, {Karl M.}",
note = "{\textcopyright} 2020. The American Astronomical Society. All rights reserved.",
year = "2021",
month = jan,
day = "4",
doi = "10.3847/1538-4357/abc68f",
language = "English",
volume = "906",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry

AU - Dzib, Sergio A.

AU - Forbrich, Jan

AU - Reid, Mark J.

AU - Menten, Karl M.

N1 - © 2020. The American Astronomical Society. All rights reserved.

PY - 2021/1/4

Y1 - 2021/1/4

N2 - 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.

AB - 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.

KW - astro-ph.SR

KW - astro-ph.GA

U2 - 10.3847/1538-4357/abc68f

DO - 10.3847/1538-4357/abc68f

M3 - Article

VL - 906

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 24

ER -