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Multichannel astrometric photometer-based parallaxes of evolved stars - Chi Cygni, 51 Andromedae, and OP AndromedaeUsing data from Allegheny Observatory's Thaw/MAP astrometric system, absolute parallaxes are presented for Chi Cygni, 51 Andromedae, the newly discovered RS CVn variable OP Andromedae, and selected stars in these fields. Using existing angular diameter measures and the new parallaxes, linear diameters for Chi Cygni and 51 And are given. Chi Cygni has a perturbation in declination having a period of 0.75 yr and an amplitude of +/- 5 mas. Owing to the extreme variability of Chi Cygni, no further characterization of the system is possible at this time. Other results of spectral interest include the detection of a perturbation in the motion of BD +47 deg 466. This system was found to have a parallax of 14.4 +/- 1.2 mas.
Document ID
19920028686
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Stein, John W.
(Pittsburgh, University PA, United States)
Date Acquired
August 15, 2013
Publication Date
August 20, 1991
Publication Information
Publication: Astrophysical Journal
Volume: 377
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
92A11310
Funding Number(s)
CONTRACT_GRANT: NAG2-53
CONTRACT_GRANT: NSF AST-86-17642
Distribution Limits
Public
Copyright
Other

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