Astrophysics and Space Science

, Volume 301, Issue 1–4, pp 11–20 | Cite as

Stability in Period and Amplitude: The High-Amplitude δ Scuti Star YZ Boötis

  • Ai-Ying Zhou
Original Article


The variability of period and amplitude of the high-amplitude δ Scuti star YZ Boo was thoroughly investigated based on a comprehensive analysis of new time-series photometry and other available data. Fourier analysis, OCdiagram, and wavelet analysis establish a clear picture for the star's time-dependent behavior in period and amplitude. We detected no additional frequencies being intrinsic to the variable or caused by amplitude/frequency modulation confirming its mono-periodicity. We reveal the pulsation of YZ Boo is quite stable in both period and amplitude over the past 50 years. Short-term variations at cycle level including “anomalous cycles” are present clearly, while long-term variations in period and amplitude at annual base are insignificant. However, we note an increment from 2000 to 2003 in both period and amplitude. In 2000 the amplitude reached the lowest. This is indicated by the Fourier and wavelet results. In the long term, OCfits and wavelet analysis agree with the Fourier results that the period change of YZ Boo is still inconclusive.


Stars: variable: δ Scuti stars Stars: oscillations Stars: individual: YZ Boötis 


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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • Ai-Ying Zhou
    • 1
  1. 1.National Astronomical ObservatoriesChinese Academy of SciencesBeijingChina

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