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First Detection of a Frequency Multiplet in the Line Profile Variations of RR Lyrae: Towards an Understanding of the Blazhko Effect1

Published online by Cambridge University Press:  12 April 2016

K. Kolenberg ,
C. Aerts ,
M. Chadid  and
D. Gillet
K. Kolenberg
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
C. Aerts
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
M. Chadid
Affiliation:
European Southern Observatory, Alonso de Cordova, 3107, P.O. 19001, Santiago, Chile
D. Gillet
Affiliation:
Observatoire de Haute-Provence, Saint-Michel-l’Observatoire, F-04870, France

Abstract

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We provide the first detection of a frequency multiplet in the line profile variations of RR Lyrae. Performing a period analysis on 669 high resolution line profiles obtained with the spectrograph ELODIE at OHP, we clearly detect a multiplet structure, with a separation equal to the Blazhko frequency, around the main frequency and its harmonics. The triplet components are very prominent; additional observations are needed to decide about the existence of a quintuplet. The complete understanding of the origin of the Blazhko effect still needs further theoretical modelling and better observations. Our detection of the frequency multiplet in the line profile variations is a first essential step towards a decisive confrontation between the theoretical models and the observations.

Type
Part 4. Blazhko Phenomenon
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 286 - 290
Copyright
Copyright © Astronomical Society of the Pacific 2000

Footnotes

2

Aspirant Fellow, Fund for Scientific Research, Flanders

3

Postdoctoral Fellow, Fund for Scientific Research, Flanders

1

Based on observations obtained at the Haute-Provence Observatory in France

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