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

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


Astronomy and Astrophysics, Volume 448, Issue 1, March II 2006, pp.171-180

"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...."


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[Press release] A River of Stars Streaming Across the Northern Sky

Astronomers Discover a River of Stars Streaming Across the Northern Sky

PASADENA, Calif.--Astronomers have discovered a narrow stream of stars extending at least 45 degrees across the northern sky. The stream is about 76,000 light-years distant from Earth and forms a giant arc over the disk of the Milky Way galaxy...The stream emanates from a cluster of about 50,000 stars known as NGC 5466.

http://pr.caltech.edu/media/Press_Releases/PR12811.html

[preprint] Abundance anomalies in NGC 2808

NGC 2808 :: Preprint

Abundance anomalies in NGC 2808

Authors: G. Pace, A. Recio-Blanco, G. Piotto, Y. Momany
Comments: 11 pages, 7 figures, accepted by A&A

"We present metallicity measurements of 25 stars in the blue horizontal branch of the Galactic globular cluster NGC 2808. Our measurements are based on moderate-resolution spectra taken with the multi-object fiber facility FLAMES-UVES, mounted on Kueyen at the Very Large Telescope. We confirm that stars hotter than a threshold temperature have super-solar abundance, while the cooler ones respect the nominal metallicity of the cluster, i.e. [Fe/H] ~ -1.1...."

URL: http://babbage.sissa.it/abs/astro-ph/0602629

[preprint] Detection of a 45 Degree Tidal Stream Associated with the GC NGC 5466

NGC 5466 :: preprint

C. J. Grillmair, R. Johnson

"Detection of a 45 Degree Tidal Stream Associated with the Globular Cluster NGC 5466"

We report on the detection in Sloan Digital Sky Survey data of a 45 degree tidal stream of stars, extending from Bootes to Ursa Major, which we associate with the halo globular cluster NGC 5466. Using an optimal contrast, matched filter technique, we find a long, almost linear stellar stream with an average width of 1.4 degrees. The stream is an order of magnitude more tenuous than the stream associated with Palomar 5. The stream's orientation on the sky is consistent to a greater or lesser extent with existing proper motion measurements for the cluster.

URL : http://babbage.sissa.it/abs/astro-ph/0602602