Application of the Butterworth's filter for excluding low-frequency trends

Details Application of the Butterworth's filter for excluding low-frequency trends Application of the Butterworth's filter for excluding low-frequency trends

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005coast.146...40d&link_type=abstract

Communications in Asteroseismology, vol. 146, p. 40-44

Physics

Scientific paper

In the research of roAp stars low-frequency atmospheric and instrumental trends of data can be removed by the application of Butterworth's filter. Here we show the validity of such a technique by using a data set in which we combined the observed star's data and an artificial frequency spectrum. It is shown that the clearing of the data in the required frequency region is acquired due to the reduction of low-frequency noise, whereas the frequency solution practically does not change. The cleaning enables an easier detection of dominant frequencies in the investigated frequency region.

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