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Kinematic parameters of the galactic spiral pattern from data on open star clusters and OB stars

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Abstract

Data on the positions, radial velocities, and proper motions of open star clusters and OB stars are used to obtain the rotation curve of the Galaxy fitted by a polynomial in inverse powers of the distances from the Galactic rotation axis. We determine the locations of the corotation region and the inner and outer Lindblad resonances using a previously estimated pattern speed. Based on data for objects of the Carina-Sagittarius and Orion arms, we have determined the distortion amplitudes of the velocity field of the Galactic disk, ƒ R = −3.97±4.79 km s−1 and f θ=+13.27±2.57 km s−1.

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Authors and Affiliations

  1. Astronomical Observatory, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia

    M. É. Popova & A. V. Loktin

Authors
  1. M. É. Popova
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  2. A. V. Loktin
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 31, No. 10, 2005, pp. 743–748.

Original Russian Text Copyright © 2005 by Popova, Loktin.

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Popova, M.É., Loktin, A.V. Kinematic parameters of the galactic spiral pattern from data on open star clusters and OB stars. Astron. Lett. 31, 663–667 (2005). https://doi.org/10.1134/1.2075308

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  • DOI: https://doi.org/10.1134/1.2075308

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