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Radial-Velocity Curves for RR Lyrae Stars in the Globular Clusters M5 and M92 Obtained using Synthetic Spectra Cross-Correlation Templates
Jesper Storm, Bruce W. Carney, David W. Latham, Robert J. Davis and John B. Laird
Publications of the Astronomical Society of the Pacific
Vol. 104, No. 673 (1992 March), pp. 168-178
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40679843
Page Count: 11
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Radial-velocity curves are presented for the RR Lyrae stars VI and V3 in the lowmetallicity globular cluster M92 (NGC 6341) and V8 and V28 in the intermediate-metallicity globular cluster M5 (NGC 5904) based on between 50 and 90 observations per star. The radial velocities were derived by cross-correlating spectra obtained with the Multiple Mirror Telescope échelle spectrograph with synthetic templates calculated using Kurucz's model atmospheres (ATLAS8) and synthetic spectrum (SYNTHE) codes. The synthetic templates provide a better match to the observed spectra than the available observed templates, especially for the metal-poor stars, resulting in high-precision radialvelocities good to a few km s⁻¹ in most cases. We find systemic velocities of — 125.4, — 122.6, + 48.7, and + 53.6 km s⁻¹ for M92-V1, M92-V3, M5-V8, and M5-V28, respectively, in good agreement with previous determinations of cluster mean velocities.
Publications of the Astronomical Society of the Pacific © 1992 The University of Chicago Press