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Showing 2006 · astro-phShow all
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astro-ph2006★ 38 cited
Image-Subtraction Photometry of Variable Stars in the Globular Clusters NGC 6388 and NGC 6441
T. M. Corwin, A. N. Sumerel, B. J. Pritzl +4
We have applied Alard's image subtraction method (ISIS v2.1) to the observations of the globular clusters NGC 6388 and NGC 6441 previously analyzed using standard photometric techn…
astro-ph2006★ 5 cited
Near-Field Cosmology with Horizontal Branch and RR Lyrae Stars
M. Catelan
The importance of horizontal branch and RR Lyrae stars is discussed in the context of cosmological arguments for the formation of the Galactic halo and its satellite dwarf galaxies…
astro-ph2006★ 61 cited
New Metallicities of RR Lyrae Stars in omega Centauri: Evidence for a Non He-Enhanced Metal-Intermediate Population
A. Sollima, J. Borissova, M. Catelan +4
We present new spectroscopic metal abundances for 74 RR Lyrae stars in omega Cen obtained with FLAMES. The well-known metallicity spread is visible among the RR Lyrae variables. Th…