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THE MCDONALD OBSERVATORY 2.1-m RADIAL VELOCITY SPECTROMETER
M. H. SLOVAK, G. W. VAN CITTERS and T. G. BARNES III
Publications of the Astronomical Society of the Pacific
Vol. 91, No. 544 (December 1979), pp. 840-847
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40677617
Page Count: 8
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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 mυ ≃ 10 in approximately 12 minutes with an uncertainty of a = 3.6 km s⁻¹ . 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⁻¹. 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.
Publications of the Astronomical Society of the Pacific © 1979 The University of Chicago Press