Absolute proper motions of globular clusters

Details Absolute proper motions of globular clusters Absolute proper motions of globular clusters

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26at...25..185d&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 25, Issue 2, p.185-188

Astronomy and Astrophysics

Astronomy

Globular Clusters, Milky Way, Proper Motions, Kinematics

Scientific paper

The absolute proper motions for a total of 92 globular clusters of the Milky Way (60% of all clusters included in the catalogue published by Harris) are inferred from the UCAC2 proper motions of their likely member stars. The median formal error of the cluster proper motions is equal to 0.8marcsecyear-1 in both right ascension and declination, whereas the proper-motion errors of individual clusters range from 0.2 to 3marcsecyear-1. Tests performed demonstrate the overall validity of the cluster motions; the resulting transverse velocities remain, on the average, virtually constant out to a heliocentric distance of 15kpc and the full space velocity of most of the clusters relative to the Galactic centre remains, on the average, unchanged near 190kms-1 out to a Galactocentric distance of about 20kpc, in agreement with the overall isothermal structure of the Galactic halo.

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