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Measurements have also been conducted on spectra of IAU radial
velocity standards. Most observations were conducted at dispersions
of 40 and 80 A/mm. Arcturus was observed repeatedly but some hotter
stars with sharp lines were also studied. The plates were scanned on
the RGO PDS machine and the results show that the radial velocities
measured are consistent with the IAU scale. In each case the standard
deviation is quoted for the uncertainty.
- At 40 A/mm for 18 observations of 5 IAU standards, the mean
difference spectrograph - IAU = +0.2 +- 1.9,km/s
- At 40 A/mm for 11 observations of Arcturus, the difference
(standard deviation from IAU value) was 1.1,km/s
- At 40 A/mm for 13 observations of 9 other stars, the mean
difference spectrograph - IAU = -0.8 +- 3.9,km/s
- At 40 A/mm for 5 observations of 5 stars (1 IAU standard), the mean
difference spectrograph - IAU = -2.2 +- 7.6,km/s
- At 40 A/mm for 6 observations of 4 stars (1 IAU standard), the mean
difference spectrograph - IAU = -0.8 +- 4.8,km/s
The commissioning data were obtained by D.J. Stickland and R.P. Edwin.
manuals store
Tue Aug 5 00:46:52 BST 1997