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Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue

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Abstract

We have studied the kinematic properties of young pre-main-sequence stars. We have selected these stars based on data from the Gaia DR2 catalogue by invoking a number of photometric infrared surveys. Using 4564 stars with parallax errors less than 20%, we have found the following parameters of the angular velocity of Galactic rotation: \({{\Omega }_{0}} = 28.84 \pm 0.10\) km s–1 kpc–1, \(\Omega _{0}^{'} = - 4.063 \pm 0.029\) km s–1 kpc–2, and \(\Omega _{0}^{{''}} = 0.766 \pm 0.020\) km s–1 kpc–3, where the Oort constants are \(A = 16.25 \pm 0.33\) km s–1 kpc–1 and \(B = - 12.58 \pm 0.34\) km s–1 kpc–1. The circular rotation velocity of the solar neighborhood around the Galactic center is \({{V}_{0}} = 230.7 \pm 4.4\) km s–1 for the adopted Galactocentric distance of the Sun \({{R}_{0}} = 8.0 \pm 0.15\) kpc. The residual velocity dispersion for the stars considered is shown to be low, suggesting that they are extremely young. The residual velocity dispersion averaged over three coordinates is ~11 km s–1 for Herbig Ae/Be stars and ~7 km s–1 for T Tauri stars.

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ACKNOWLEDGMENTS

We are grateful to the referee for the useful remarks that contributed to an improvement of the paper.

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  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, 196140, St. Petersburg, Russia

    V. V. Bobylev & A. T. Bajkova

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  1. V. V. Bobylev
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Correspondence to V. V. Bobylev.

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Translated by V. Astakhov

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Bobylev, V.V., Bajkova, A.T. Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue. Astron. Rep. 64, 1042–1049 (2020). https://doi.org/10.1134/S1063772920120033

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