Periodic pattern in the Cepheid space velocity field and the spiral arms of our Galaxy

Details Periodic pattern in the Cepheid space velocity field and the spiral arms of our Galaxy Periodic pattern in the Cepheid space velocity field and the spiral arms of our Galaxy

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..518m&link_type=abstract

Astronomy Letters, Volume 25, Issue 8, August 1999, pp.518-525

Astronomy and Astrophysics

Astronomy

10

Scientific paper

An analysis of the velocity field of Cepheids located within 3 kpc of the Sun revealed periodic variations in the magnitude and direction of residual velocities along the galactic radius-vector with a typical scale length of lambda = 1.9 +/- 0.5 kpc. The amplitudes of velocity perturbations in the radial and azimuthal directions are found to be f_R = 6.4 +/- 1.2 km/s and ftheta = 2.4 +/- 1.2 km/s, respectively. The locations of the spiral arms, as inferred from the Cepheid velocity field, agree with those of starburst regions and with kinematics of OB-associations in the inner Galaxy provided that the solar neighborhood considered is inside corotation.

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