Space velocity of the globular cluster NGC 288 and astrometry with the CTIO 4 meter telescope

Details Space velocity of the globular cluster NGC 288 and astrometry with the CTIO 4 meter telescope Space velocity of the globular cluster NGC 288 and astrometry with the CTIO 4 meter telescope

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2182g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2182-2191.

Astronomy and Astrophysics

Astronomy

19

Astrometry, Globular Clusters, Stellar Motions, Galactic Structure, Milky Way Galaxy

Scientific paper

Absolute proper motions, referred to galaxies, are determined for about 7000 stars to B about 22.5 in a field near the South Galactic Pole. The proper motions are based on a series of eight CTIO 4 m telescope prime focus plates spanning an epoch difference of three years. Special attention has been given to the problem of accurately correcting for the optical field angle distortion and correcting for the magnitude equation introduced by guiding errors. The field of view contains the globular cluster NGC 288. Our measurement of the cluster's absolute proper motion, when combined with published estimates of its distance modulus and radial velocity, indicates a space velocity with respect to the Local Standard of Rest of U(LSR) about +6 +/- 41 km/s, V(LSR) about -300 +/- 41 km/s, and W(LSR) about +54 +/- 1 km/s. This space velocity indicates that NGC 288 is on a retrograde orbit.

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