Period analysis for simultaneous multichannel photometric observations

¹ Astronomy Division, Department of Physical Sciences, P.O. Box 3000, FIN-90014 University of Oulu, Finland
² Tartu Observatory, 61602 Tõravere, Estonia

Send offprint request to: J. You, e-mail: jyou@paju.oulu.fi

Received: 15 June 2000
Accepted: 3 August 2000

Abstract

The method of three stage weighted period analysis is generalized for simultaneous multichannel observations. The new method is based on the phase dispersion minimization over all channels simultaneously. The three stages in the full algorithm are phase dispersion minimization method (PDM), linear modeling (LM) and nonlinear modeling (NLM). Simple computational tests of the multichannel period analysis (MPA) are presented. We show that the method has advantages if compared with methods where single channels are analysed separately. We derive a general formula for spurious periods and demonstrate that the interpretation of peaks in the PDM spectra can be more complicated than in classical power spectra.