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

  • A.R. Upgren (a1), E.W. Weis (a1), H.-H. Fu (a1) and J.T. Lee (a2)

Abstract

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.

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References

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

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

  • A.R. Upgren (a1), E.W. Weis (a1), H.-H. Fu (a1) and J.T. Lee (a2)

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