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Issue A&A
Volume 448, Number 1, March II 2006
Page(s) 171 - 180
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20054327



A&A 448, 171-180 (2006)
DOI: 10.1051/0004-6361:20054327

Probable member stars of the gravitational theory-testing globular clusters AM 1, Pal 3 and Pal 14

M. Hilker

Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
    e-mail: mhilker@astro.uni-bonn.de

(Received 9 October 2005 / Accepted 17 October 2005 )

Abstract
Some of the Galactic outer halo globular clusters are excellent tools to probe gravitational theories in the regime of weak accelerations. The measurement of the line-of-sight velocity dispersion among stars in these clusters will differentiate between the validity of Newtonian dynamics (low velocity dispersion) and the possiblity of modified Newtonian dynamics (MOND) or dark matter dominated globular clusters (high velocity dispersion). In this paper, the properties of probable member stars of the three best-case gravitational theory-testing clusters AM 1, Pal 3 and Pal 14 are presented. The member selection is based on VLT photometry in Johnson $\it BV$. The positions of the stars were determined with an accuracy of the order of $\leq$$0\farcs2$, allowing their direct use for follow-up spectroscopy. The distance, reddening, age and metallicities of the clusters were estimated from isochrone fitting. Furthermore, improved structural parameters, like central coordinates, ellipticity, half-light radius, King model core and tidal radius, are presented.


Key words: Galaxy: globular clusters: individual: AM 1 -- Galaxy: globular clusters: individual: Pal 3 -- Galaxy: globular clusters: individual: Pal 14 -- astrometry -- Galaxy: kinematics and dynamics

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