You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis 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.
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
You can always find the topics here!Topics: Radial velocity, Spectrometers, Velocity, Calibration, Optical focus, Hour angle, Cross correlation, Telescopes, Cepheids, Stellar classification
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
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.
Preview not available
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