Kinematic Parameters of the Galactic Spiral Pattern from Data on Open Star Clusters and OB Stars

Details Kinematic Parameters of the Galactic Spiral Pattern from Data on Open Star Clusters and OB Stars Kinematic Parameters of the Galactic Spiral Pattern from Data on Open Star Clusters and OB Stars

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..663p&link_type=abstract

Astronomy Letters, vol. 31, Issue 10, p.663-667

Astronomy and Astrophysics

Astronomy

7

Galactic Spiral Pattern - Galactic Rotation Curve - Open Star Clusters - Ob Stars

Scientific paper

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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