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Performance of the Zeeman analyzer system of the McDonald Observatory 2.7 meter telescopeThe paper describes a multichannel photoelectric Zeeman analyzer at the coude spectrograph of the McDonald 2.7 m reflector. A comparison of Lick and McDonald observations of HD 153882 reveals no significant difference in slopes or zero points of the two magnetic fields indicating that the systematic scale difference of 30-40% is probably instrumental in origin. Observations of the magnetic variable beta Cor Bor revealed a more nearly sinusoidal magnetic curve with less internal scatter than the photographically determined field measures of the Lick and Mauna Kea Zeeman systems. Investigation of periodicity in the secularly varying magnetic minima of beta Cor Bor did not yield evidence of previously noted periodicities other than that expected from the time structure of the data sampling.
Document ID
19800042841
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vogt, S. S. (McDonald Observatory Austin, TX, United States)
Tull, R. G. (McDonald Observatory Austin, TX, United States)
Kelton, P. W. (McDonald Observatory; Texas, University Austin, Tex., United States)
Date Acquired
August 10, 2013
Publication Date
February 15, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NSF AST-75-02404
CONTRACT_GRANT: NGR-40-012-152
Distribution Limits
Public
Copyright
Other