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An extensive photometric study of the Blazhko RR Lyrae star DM Cyg

Jurcsik, J. ; Hurta, Zs ; Sódor, Á. ; Szeidl, B. ; Nagy, I. ; Posztobányi, K. ; Váradi, M. ; Vida, K. ; Belucz, B. ; Dékány, I. ; Hajdu, G. ; Kővári, Zs ; Kun, E.

In: Monthly Notices of the Royal Astronomical Society, 2009, vol. 397, no. 1, p. 350-360

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    Titre
    • An extensive photometric study of the Blazhko RR Lyrae star DM Cyg
    Auteur
    • Jurcsik, J.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Hurta, Zs. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Sódor, Á.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Szeidl, B.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Nagy, I.. Eötvös University, Department of Astronomy, H-1518 Budapest, PO Box 49, Hungary
    • Posztobányi, K.. AEKI, KFKI Atomic Energy Research Institute, Thermohydraulic Department, H-1525 Budapest 114, PO Box 49, Hungary
    • Váradi, M.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Vida, K.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Belucz, B.. Eötvös University, Department of Astronomy, H-1518 Budapest, PO Box 49, Hungary
    • Dékány, I.. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Hajdu, G.. Eötvös University, Department of Astronomy, H-1518 Budapest, PO Box 49, Hungary
    • Kővári, Zs. Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary
    • Kun, E.. Department of Experimental Physics and Astronomical Observatory, University of Szeged, 6720 Szeged, Dóm tér 9, Hungary
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2009, vol. 397, no. 1, p. 350-360. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:302458
    Summary
    DM Cyg, a fundamental mode RRab star, was observed in the 2007 and 2008 seasons in the framework of the Konkoly Blazhko Survey. Very small amplitude light-curve modulation was detected with 10.57 d modulation period. The maximum brightness and phase variations do not exceed 0.07 mag and 7 min, respectively. In spite of the very small amplitude of the modulation, beside the frequency triplets characterizing the Fourier spectrum of the light curve, two quintuplet components were also identified. The accuracy and the good phase coverage of our observations made it possible to analyse the light curves at different phases of the modulation separately. Utilizing the inverse photometric Baade-Wesselink method, we could detect very small systematic changes in the global mean physical parameters of DM Cyg during its Blazhko cycle. The detected changes are similar to what we have already found for a large modulation amplitude Blazhko variable, MW Lyrae. The amplitudes of the detected changes in the physical parameters of DM Cyg are only about 10 per cent of those that have been found in MW Lyr. This is in accordance with its small modulation amplitude being about one-tenth of the modulation amplitude of MW Lyr. The pulsation period of DM Cyg has been increasing by a rate of β= 0.091 d Myr−1 during the hundred-year time base of the observations. Konkoly archive photographic observations indicate that when the pulsation period of the variable was shorter by Δppuls= 5 × 10−6 d the modulation period was longer by Δpmod= 0.066 d than today