Radial-velocity curves for RR Lyrae stars in the globular clusters M5 and M92 obtained using synthetic spectra cross-correlation templates

Details Radial-velocity curves for RR Lyrae stars in the globular clusters M5 and M92 obtained using synthetic spectra cross-correlation templates Radial-velocity curves for RR Lyrae stars in the globular clusters M5 and M92 obtained using synthetic spectra cross-correlation templates

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..168s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, March 1992, p. 168-178. Research supported by Dani

Astronomy and Astrophysics

Astronomy

9

Cross Correlation, Globular Clusters, Radial Velocity, Ultrahigh Frequencies, Giant Stars, Star Distribution, Templates

Scientific paper

Radial-velocity curves are presented for the RR Lyrae stars V1 and V3 in the low-metallicity globular cluster M92 (NGC 6341) and V8 and V28 in the intermediate-metallicity globular cluster MS (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 echelle 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 radial- velocities 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.

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