Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

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
Stable URL: http://www.jstor.org/stable/40679843
Page Count: 11
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Radial-Velocity Curves for RR Lyrae Stars in the Globular Clusters M5 and M92 Obtained using Synthetic Spectra Cross-Correlation Templates
Preview not available

Abstract

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.

Page Thumbnails

  • Thumbnail: Page 
168
    168
  • Thumbnail: Page 
169
    169
  • Thumbnail: Page 
170
    170
  • Thumbnail: Page 
171
    171
  • Thumbnail: Page 
172
    172
  • Thumbnail: Page 
173
    173
  • Thumbnail: Page 
174
    174
  • Thumbnail: Page 
175
    175
  • Thumbnail: Page 
176
    176
  • Thumbnail: Page 
177
    177
  • Thumbnail: Page 
178
    178