Coude radial velocity observations at Calar Alto Observatory Zero-point and accuracy

Details Coude radial velocity observations at Calar Alto Observatory Zero-point and accuracy Coude radial velocity observations at Calar Alto Observatory Zero-point and accuracy

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...66..111g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 66, no. 1, Oct. 1986, p. 111-116. Research supported by the

Astronomy and Astrophysics

Astrophysics

1

Late Stars, Radial Velocity, Stellar Spectrophotometry, Astrometry, Astronomical Catalogs, Line Spectra

Scientific paper

The radial-velocity performance of the coudé spectrograph at the 2.2 m telescope of Calar Alto Observatory has been investigated on the basis of measurements of 57 spectrograms of 20 IAU standard radial-velocity stars. Analysis of the measurements yields the following results: (1) A list of 20 comparison lines and 16 stellar lines suitable for radial-velocity determination in F5 - M5 stars has been established. (2) Measurements based on these lines have an average internal mean error σint = 0.24 km s-1 and a plate-to-plate agreement for constant stars of σext = 0.58 km s-1. (3) The mean zero-point difference from the IAU standard system is derived. The data supply supporting evidence for a systematic difference between bright and faint IAU standards.

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