Kinematic parameters of the galactic spiral pattern from data on open star clusters and OB stars |
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| Authors: | M É Popova A V Loktin |
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| Institution: | (1) Astronomical Observatory, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia |
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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, ?R = ?3.97±4.79 km s?1 and fθ=+13.27±2.57 km s?1. |
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| Keywords: | Galactic spiral pattern Galactic rotation curve open star clusters OB stars |
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