Journal Article

An alternative to O — C analysis of variable star periods

F. Lombard

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 4, pages 657-666
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01214.x
An alternative to O — C analysis of variable star periods

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Abstract

For more than a century now astronomers have used the O — C (Observed minus Calculated) method to detect the presence of systematic changes in the periods of variable stars. The method is based on an analysis of residuals from a linear fit to the observed epochs. A rather common error in applications of the method is a failure to make provision for autocorrelation which exists in the data. In this paper we consider a model that accounts for the presence of autocorrelation and develop an alternative to the O — C method of analysis. The proposed method focuses on the frequency domain characteristics of observed periods. Its use is illustrated by application to data from the variable stars X Aurigae and RY Sagittarii.

Keywords: methods: data analysis; methods: statistical; stars: individual: X Aur; stars: individual: RY Sgr; stars: variables: other

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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