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Proper motions and kinematics of selected bulge globular clusters

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posted on 2024-07-11, 19:30 authored by L. J. Rossi, S. Ortolani, B. Barbuy, E. Bica, A. Bonfanti
We computed proper motions of a selected sample of globular clusters projected on the central bulge, employing CCD images gathered along the last 25 years at the ESO-NTT, ESO-Danish and HST telescopes. We presented a method to derive their proper motions, and a set of coordinate transformations to obtain 3D Galactic velocity vectors of the clusters. We analysed 10 globular clusters, namely Terzan 1, Terzan 2, Terzan 4, Terzan 9, NGC 6522, NGC 6558, NGC 6540, AL~3,ESO456--SC38 and Palomar 6. For comparison purposes we also studied the outer bulge cluster NGC 6652. We discuss the general properties of the proper-motion-cleaned Colour-Magnitude Diagrams, derived for the first time for most of them. A general conclusion is that the inner bulge globular clusters have clearly lower transverse motions (and spatial velocities) than halo clusters, and appear to be trapped in the bulge bar.

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ISSN

0035-8711

Journal title

Monthly Notices of the Royal Astronomical Society

Volume

450

Issue

3

Pagination

18 pp

Publisher

Oxford University Press

Copyright statement

Copyright © 2015. This article has been accepted for publication in the Monthly Notices of the Royal Astronomical Society ©: 2015 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Language

eng

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