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The OSACA database and a kinematic analysis of stars in the solar neighborhood

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Abstract

We transformed radial velocities compiled from more than 1400 published sources, including the Geneva-Copenhagen survey of the solar neighborhood (CORAVEL-CfA), into a uniform system based on the radial velocities of 854 standard stars in our list. This enabled us to calculate the average weighted radial velocities for more than 25000 HIPPARCOS stars located in the local Galactic spiral arm (Orion arm) with a median error of ±1 km/s. We use these radial velocities together with the stars’ coordinates, parallaxes, and proper motions to determine their Galactic coordinates and space velocities. These quantities, along with other parameters of the stars, are available from the continuously updated Orion Spiral Arm Catalogue (OSACA) and the associated database. We perform a kinematic analysis of the stars by applying an Ogorodnikov-Milne model to the OSACA data. The kinematics of the nearest single and multiple main-sequence stars differ substantially. We used distant (-r ≈ 0.2 kpc) stars of mixed spectral composition to estimate the angular velocity of the Galactic rotation, ωo = −25.7 ± 1.2 kms−1 kpc−1, and the vertex deviation, l = 13° ± 2°, and detected a negative K effect. This negative K effect is most conspicuous in the motion of A0–A5 giants and is equal to K = −13.1 ± 2.0 kms−1 kpc−1.

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Authors and Affiliations

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

    V. V. Bobylev, G. A. Goncharov & A. T. Bajkova

Authors
  1. V. V. Bobylev
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  2. G. A. Goncharov
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  3. A. T. Bajkova
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Additional information

Original Russian Text © V.V. Bobylev, G.A. Goncharov, A.T. Bajkova, 2006, published in Astronomicheskiĭ Zhurnal, 2006, Vol. 83, No. 9, pp. 821–836.

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Bobylev, V.V., Goncharov, G.A. & Bajkova, A.T. The OSACA database and a kinematic analysis of stars in the solar neighborhood. Astron. Rep. 50, 733–747 (2006). https://doi.org/10.1134/S1063772906090071

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  • DOI: https://doi.org/10.1134/S1063772906090071

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