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Applications of the magneto-optical filter to stellar pulsation measurementsA proposed method of employing the Cacciani magneto-optical filter (MOF) for stellar seismology studies is described. The method relies on the fact that the separation of the filter bandpasses in the MOF can be changed by varying the level of input power to the filter cells. With the use of a simple servosystem the bandpass of a MOF can be tuned to compensate for the changes in the radial velocity of a star introduced by the orbital motion of the Earth. Such a tuned filter can then be used to record intensity fluctuations through the MOF bandpass over an extended period of time for each given star. Also, the use of a two cell version of the MOF makes it possible to alternately chop between the bandpass located in the stellar line wing and a second bandpass located in the stellar continuum. Rapid interchange between the two channels makes it possible for atmospheric-introduced noise to be removed from the time series.
Document ID
19860002720
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Rhodes, E. J., Jr. (University of Southern California Los Angeles, CA, United States)
Cacciani, A. (University of Southern California Los Angeles, CA, United States)
Tomczyk, S. (University of Southern California Los Angeles, CA, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1984
Subject Category
Astronomy
Report/Patent Number
NASA-CR-176282
NAS 1.26:176282
Accession Number
86N12187
Funding Number(s)
CONTRACT_GRANT: NAGW-472
CONTRACT_GRANT: NAGW-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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