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Overtone and multi-mode RR Lyrae stars in the globular cluster M3

  • Jurcsik, J.
  • Smitola, P.
  • Hajdu, G.
  • Sódor, Á.
  • Nuspl, J.
  • Kolenberg, K.
  • Fűrész, G.
  • Moór, A.
  • Kun, E.
  • Pál, A.
  • Bakos, J.
  • Kelemen, J.
  • Kovács, T.
  • Kriskovics, L.
  • Sárneczky, K.
  • Szalai, T.
  • Szing, A.
  • Vida, K.
Publication Date
Apr 23, 2015
Submission Date
Apr 23, 2015
DOI: 10.1088/0067-0049/219/2/25
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The overtone and multi-mode RR Lyrae stars in the globular cluster M3 are studied using a 200-d long, $B,V$ and $I_{\mathrm C}$ time-series photometry obtained in 2012. 70\% of the 52 overtone variables observed show some kind of multi-periodicity (additional frequency at ${f_{0.61}}={f_{\mathrm {1O}}}/0.61$ frequency ratio, Blazhko effect, double/multi-mode pulsation, period doubling). A signal at 0.587 frequency ratio to the fundamental-mode frequency is detected in the double-mode star, V13, which may be identified as the second radial overtone mode. If this mode-identification is correct, than V13 is the first RR Lyrae star showing triple-mode pulsation of the first three radial modes. Either the Blazhko effect or the ${f_{0.61}}$ frequency (or both of these phenomena) appear in 7 double-mode stars. The $P_{\mathrm{1O}}/P_{\mathrm{F}}$ period ratio of RRd stars showing the Blazhko effect are anomalous. A displacement of the main frequency component at the fundamental-mode with the value of modulation frequency (or its half) is detected in three Blazhko RRd stars parallel with the appearance of the overtone-mode pulsation. The ${f_{0.61}}$ frequency appears in RRc stars that lie at the blue side of the double-mode region and in RRd stars, raising the suspicion that its occurrence may be connected to double-mode pulsation. The changes of the Blazhko and double-mode properties of the stars are also reviewed using the recent and archive photometric data.

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