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Search for Stellar Streams Based on Data from the RAVE5 and Gaia TGAS Catalogues

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Abstract

We have analyzed the space velocities of stars with the proper motions and trigonometric parallaxes from the Gaia TGAS catalogue in combination with the line-of-sight velocities from the RAVE5 catalogue. In the V, \(\sqrt {{U^2} + 2{V^2}} \) velocity plane we have identified three clumps, BB17-1, BB17-2, and BB17-3, in the region of large velocities (V<−150 km s−1). The stars of the BB17-1 and BB17-2 clumps are associated with the kinematic groups VelHel-6 and VelHel-7 detected previously by Helmi et al. We give the greatest attention to the BB17-3 clump. The latter is shown to be most closely linked with the debris of the globular cluster ω Cen. In the BB17-3 clump we have identified 28 stars with a low velocity dispersion with respect to the center of their distribution. All these stars have very close individual age estimates: log t ≈ 10. The distribution of metallicity indices in this sample is typical for the stars of the globular cluster ω Cen. In our opinion, the BB17-3 clump can be described as a homogeneous stream in the debris of the cluster ω Cen.

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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia

    A. T. Bajkova & V. V. Bobylev

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  1. A. T. Bajkova
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Correspondence to A. T. Bajkova.

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Original Russian Text © A.T. Bajkova, V.V. Bobylev, 2018, published in Pis’ma v Astronomicheskii Zhurnal, 2018, Vol. 44, No. 3, pp. 219–228.

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Bajkova, A.T., Bobylev, V.V. Search for Stellar Streams Based on Data from the RAVE5 and Gaia TGAS Catalogues. Astron. Lett. 44, 193–201 (2018). https://doi.org/10.1134/S1063773718020019

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