Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..373g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 373-376.
Astronomy and Astrophysics
Astrophysics
Astrometry, Astronomical Catalogs, Periodic Variations, Spectrum Analysis, Stellar Motions, Zenith, Astronomical Spectroscopy, Polar Wandering (Geology), Star Distribution, Stellar Spectra
Scientific paper
Spectral analysis is used to examine the deviations of the declinations of 36 Belgrade zenith stars from BZS1(70) (1987). The variations of the declinations from linear motion are obtained by the least-squares method for each star individually. The character of the deviations are examined in order to establish by use of spectral analysis whether or not they contain some periodic variations. The results obtained indicate the presence of periodicities approximately corresponding to certain multiples of the Chandler period, but unavoidably with other periods also present. Two possible causes of these periodic variations are proposed: atmospheric influences with a periodic error in the zenith distance, and errors in the model for the apparent places of stars from which the geographic latitude is derived, including inaccuracies in the astronomical constants.
Grujic R.
Jovanovic Bozidar
Teleki G.
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