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The multiperiodic Blazhko modulation of CZ Lacertae

Sódor, Á. ; Jurcsik, J. ; Szeidl, B. ; Váradi, M. ; Henden, A. ; Vida, K. ; Hurta, Zs ; Posztobányi, K. ; Dékány, I. ; Szing, A.

In: Monthly Notices of the Royal Astronomical Society, 2011, vol. 411, no. 3, p. 1585-1596

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    Titre
    • The multiperiodic Blazhko modulation of CZ Lacertae
    Auteur
    • Sódor, Á.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Jurcsik, J.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Szeidl, B.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Váradi, M.. Observatoire de Genève, Université de Genève, CH-1290 Sauverny, Switzerland
    • Henden, A.. American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, USA
    • Vida, K.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Hurta, Zs. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Posztobányi, K.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Dékány, I.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    • Szing, A.. Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, H-1525 Budapest, Hungary
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2011, vol. 411, no. 3, p. 1585-1596. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:291920
    Summary
    A thorough analysis of the multicolour CCD observations of the RRab-type variable, CZ Lacertae, is presented. The observations were carried out in two consecutive observing seasons in 2004 and 2005 within the framework of the Konkoly Blazhko Survey of bright, northern, short-period RRab variables. The O − C variation of CZ Lac indicated that a significant period decrease took place just around the time of the CCD observations. Our data gave a unique opportunity to study the related changes in the pulsation and modulation properties of a Blazhko star in detail. Two different period components (≈ 14.6 and ≈ 18.6 d) of the Blazhko modulation were identified. Both modulation components had similar strength. The periods and amplitudes of the modulations changed significantly from the first season to the next, while the mean pulsation amplitude decreased slightly. The modulation frequencies were in a 5:4 resonance ratio in the first observing season, and then the frequencies shifted in opposite directions, and their ratio was close to the 4:3 resonance in the next season. The interaction of the two modulations caused beating with a period of 74 d in the first season, which resembled the 4-yr-long cycle of the ≈ 40-d modulation of RR Lyr. The mean values of the global physical parameters and their changes with the Blazhko phase of both modulation components were determined by the inverse photometric method