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How stable are our standard candles? Time-resolved analysis of amplitude and period changes in OGLE-III LMC Cepheids

Published online by Cambridge University Press:  27 October 2016

Maria Süveges ,
Richard I. Anderson  and
Laurent Eyer
Maria Süveges
Affiliation:
Dept. of Astronomy, University of Geneva, Switzerland email: Maria.Suveges@unige.ch, Laurent.Eyer@unige.ch
Richard I. Anderson
Affiliation:
Dept. of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USA email: ria@jhu.edu
Laurent Eyer
Affiliation:
Dept. of Astronomy, University of Geneva, Switzerland email: Maria.Suveges@unige.ch, Laurent.Eyer@unige.ch
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Abstract

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We revisit a group of OGLE-III Cepheids that exhibit nearby double peaks in their periodograms using a technique of statistics called kernel modelling. We investigate the phenomenology of these Cepheids (termed twin-peak Cepheids in this paper) in more detail by comparing a sample of 29 LMC Cepheids that exhibit twin frequency peaks with 24 other Cepheids that do not. Using the kernel technique, we investigate light curve variability as a function of time, revealing both frequency and amplitude modulations. We present the preliminary results of our study in progress, which suggests a complex interplay between the two types of modulations and their detectability via twin peaks in the periodogram. The study reveals the potential of the kernel technique to help theory and modelling with detailed data analyses, capable of tracing fine time-dependent variations of the phenomenology of pulsations for objects of surveys or observation campaigns producing sufficiently dense time sampling.

Keywords

methods: data analysismethods: statisticalstars: oscillationsCepheidsMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 505 - 508
Copyright
Copyright © International Astronomical Union 2016 

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