Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..840s&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, Dec. 1979-Jan. 1980, p. 840-847.
Astronomy and Astrophysics
Astronomy
13
Astronomical Observatories, Radial Velocity, Spectrometers, Stellar Spectra, Astronomical Spectroscopy, Calibrating, Cepheid Variables, Cross Correlation, Data Reduction, Numerical Control
Scientific paper
A single-channel photoelectric radial velocity spectrometer has been installed at the coude focus of the McDonald Observatory 2.1-m telescope. Using a Griffin cross-correlation technique, the instrument provides radial velocities at the current limiting magnitude of 10 in approximately 12 minutes with an uncertainty of 3.6 km/s. This external uncertainty is dominated by the imprecision of the General Catalog of Radial Velocities, from which the standard velocity stars were drawn. Newly available lists of high-precision standard velocity stars will enable the uncertainty to be reduced to less than 2.0 km/s. A description of the instrument, as well as the observing procedures and reduction techniques developed, is provided. The use of the instrument to study pulsating variables is exemplified by the detection of U Aql as a new long-period binary cepheid.
Barnes Thomas G. III
Slovak Mark H.
van Citters Wayne G.
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