Periodic pattern in the residual velocity field of OB-Associations

Details Periodic pattern in the residual velocity field of OB-Associations Periodic pattern in the residual velocity field of OB-Associations

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..107m&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 20, Issue 1, pp.107-110

Astronomy and Astrophysics

Astronomy

Kinematics, Ob-Associations, Spiral Structure

Scientific paper

An analysis of the space velocity field of the OB-associations within 3 kpc of the Sun revealed a periodic pattern in the residual radial velocity field along the galactic radius-vector with a typical scale length of = 2.0 ± 0.2 and a mean amplitude of fR = 7 ± 1 km s-1. The fact that the radial residual velocities of almost all OB-associations in rich star-gas complexes are directed toward the Galactic center proves that the region considered is inside the corotation circle. The azimuthal velocity field of OB-associations exhibits a well-defined periodicity in the region l < 180° and no periodicity in the region l > 180°. The galactocentric distances of the Cygnus and Perseus arms as inferred from separate analyses of radial and azimuthal residual velocity fields agree with each other within the errors.

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