High-precision radial velocities for faint giants. II - Calibration of the MMT echellette

Details High-precision radial velocities for faint giants. II - Calibration of the MMT echellette High-precision radial velocities for faint giants. II - Calibration of the MMT echellette

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..143p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. 143-150.

Astronomy and Astrophysics

Astrophysics

6

Calibrating, Echelette Gratings, Giant Stars, Globular Clusters, Late Stars, Radial Velocity, Accuracy, Cross Correlation, Velocity Measurement

Scientific paper

Use of the echellette grating at 5400 A on the moderate-resolution spectrograph of the Multiple Mirror Telescope is shown to provide radial velocities to an accuracy of 1-4 km/s for giants with V = 13-18. The internal and external errors are ascertained from observations of a dozen globular cluster giants with existing velocity measurements of better than 0.5 km/s accuracy. This assessment forms the basis for assigning uncertainties to velocities measured for giants in remote globular clusters.

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