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Title:
The Hyades cluster distance
Authors:
Hanson, R. B.
Affiliation:
AA(Royal Greenwich Observatory, Herstmonceux, Sussex, England)
Publication:
In: Star clusters; Proceedings of the Symposium, Victoria, British Columbia, Canada, August 27-30, 1979. (A80-53326 24-89) Dordrecht, D. Reidel Publishing Co., 1980, p. 71-78; Discussion, p. 79, 80. NSF-supported research.
Publication Date:
00/1980
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTROMETRY, MAIN SEQUENCE STARS, STAR CLUSTERS, STELLAR MOTIONS, DISTANCE MEASURING EQUIPMENT, HERTZSPRUNG-RUSSELL DIAGRAM, PARALLAX, STELLAR LUMINOSITY, STELLAR MASS
Bibliographic Code:
1980IAUS...85...71H

Abstract

Recent astrometric progress in determining the Hyades cluster distance is reviewed, emphasizing critical assessment of the precision and accuracy of the observations. Substantial improvement in the trigonometric parallaxes yields a mean Hyades distance modulus of 3.25 + or - 0.08 mag, nearly twice as precise as previous parallax results. New proper motions from three independent sources yield a mean distance modulus of 3.31 + or - 0.06 mag. The close agreement of the recent astrometric results suggests that the overall mean Hyades distance modulus 3.30 mag may be used with confidence in cosmic distance scale calibrations.

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