You are not currently logged in.
Access your personal account or get JSTOR access 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.
ACCURACIES OF RADIAL-VELOCITY MEASUREMENTS
HELMUT A. ABT and GREGORY H. SMITH
Publications of the Astronomical Society of the Pacific
Vol. 81, No. 481 (August 1969), pp. 332-338
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40674742
Page Count: 7
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
The accuracies of radial velocities measured with current techniques are studied to determine their dependence on dispersion, spectrum width, and line width. It is concluded that (1) illumination or guiding errors still cause a loss of accuracy by a factor of roughly 2; (2) the overall accuracies are much higher than those derived in the past; (3) broadening the spectra above 0.3-0.6 mm produces very little improvement for the increased observing time required; (4) increasing the dispersion is generally the best way to increase accuracy; (5) velocity accuracies are almost independent of line width for rotational velocities-above about 100 km/sec.
Publications of the Astronomical Society of the Pacific © 1969 The University of Chicago Press