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Map-based trigonometric parallaxes of open clusters - The PleiadesThe multichannel astrometric photometer and Thaw refractor of the University of Pittsburgh's Allegheny Observatory have been used to determine the trigonometric parallax of the Pleiades star cluster. The distance determined, 150 with a standard error of 18 parsecs, places the cluster slightly farther away than generally accepted. This suggests that the basis of many estimations of the cosmic distance scale is approximately 20 percent short. The accuracy of the determination is limited by the number and choice of reference stars. With careful attention to the selection of reference stars in several Pleiades regions, it should be possible to examine differences in the photometric and trigonometric modulus at a precision of 0.1 magnitudes.
Document ID
19910031839
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gatewood, George (Allegheny Observatory Pittsburgh, PA, United States)
Castelaz, Michael (Allegheny Observatory Pittsburgh, PA, United States)
Han, Inwoo (Allegheny Observatory Pittsburgh, PA, United States)
Persinger, Timothy (Allegheny Observatory Pittsburgh, PA, United States)
Stein, John (Allegheny Observatory Pittsburgh, PA, United States)
Date Acquired
August 15, 2013
Publication Date
November 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 364
ISSN: 0004-637X
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NSF AST-86-17642
CONTRACT_GRANT: NAG2-53
Distribution Limits
Public
Copyright
Other