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Title:
Map-based trigonometric parallaxes of open clusters: The Praesepe
Authors:
Gatewood, George; de Jonge, Joost Kiewiet
Affiliation:
AA(University of Pittsburgh, Pittsburgh, PA, US), AB(University of Pittsburgh, Pittsburgh, PA, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 166-169 (ApJ Homepage)
Publication Date:
06/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astrometry, Praesepe Star Clusters, Stellar Parallax, Stellar Spectrophotometry, Algorithms, Main Sequence Stars, Weighting Functions
DOI:
10.1086/174229
Bibliographic Code:
1994ApJ...428..166G

Abstract

Trigonometric parallaxes for stars in the Praesepe open star cluster are deduced from data collected with the Multichannel Astrometric Photometer (MAP) at the Thaw Refractor of the University of Pittsburgh's Allegheny Observatory. The weighted mean parallax of five cluster members is +5.21 +/- 0.79 mas (0.00079 arcsec), corresponding to a distance modulus of 6.42 +/- 0.33 mag. We briefly compare this result with that derived earlier for the Hyades and note agreement with the distance found by main-sequence fitting. We also discuss briefly an improvement in the weighting scheme of the centroiding algorithm used in this series.

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