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Precision Of Parallaxes From Automatic And Manual Measures From New Parallaxes Of The Hyades Cluster Region

Published online by Cambridge University Press:  03 August 2017

A.R. Upgren ,
E.W. Weis ,
H.-H. Fu  and
J.T. Lee
A.R. Upgren
Affiliation:
Van Vleck Observatory
E.W. Weis
Affiliation:
Van Vleck Observatory
H.-H. Fu
Affiliation:
Van Vleck Observatory
J.T. Lee
Affiliation:
Yale University Observatory

Abstract

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Measures of 25 members of the Hyades and about 260 field stars have been made for parallax and proper motion in two ways, automatically using a PDS microdensitometer and manually using a conventional measuring machine. Reductions show the parallax errors from the former are about half those of the latter method.

Type
Part II: Current Research
Information
Symposium - International Astronomical Union , Volume 133: Mapping the Sky: Past Heritage and Future Directions , 1988 , pp. 469 - 473
Copyright
Copyright © Kluwer 1988 

References

Hanson, R. B. and Lutz, T. E. 1983, M.N.R.A.S. 202, 201.Google Scholar
Upgren, A. R. 1973, A. J. 78, 79.CrossRefGoogle Scholar
van Altena, W. F. 1987, General Catalogue of Trigonometric Stellar Parallaxes, Fourth Edition, in preparation.Google Scholar