Volume 448, Number 1, March II 2006
|Page(s)||171 - 180|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||17 February 2006|
Probable member stars of the gravitational theory-testing globular clusters AM 1, Pal 3 and Pal 14
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany e-mail: firstname.lastname@example.org
Accepted: 17 October 2005
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 . The positions of the stars were determined with an accuracy of the order of ≤, 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
© ESO, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.