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A study on the O–C diagram and pulsation behaviour of KZ Hydra

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Abstract

New differential time-series observations of KZ Hya were secured using the V filters, and 28 new times of light maximum were identified. We collected 157 times of light maximum from the literature, unpublished data and open database, and proceeded to investigate the variations of the O–C values for light maxima with the total of 185 times of light maximum. A quasi-sinusoidal character of the O–C diagram was confirmed, and this was interpreted as a light travelling time effect due to a companion moving in an eccentric (e=0.23) orbit with a period of about 24.77 years. The periods of KZ Hya were investigated and nine frequencies were determined using the Fourier decomposition method. All nine were harmonic frequencies and no other frequency was identified.

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Authors and Affiliations

  1. Division of Science Education & Institute of Science Education, Chonbuk National University, Chonju, Korea

    Chulhee Kim

  2. Korea Astronomy and Space Science Institute, Daejeon, 305-348, Korea

    S.-L. Kim & Y.-B. Jeon

  3. Department of Astronomy & Space Science, Chungbuk National University, Cheongju, Korea

    C.-H. Kim

  4. Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand

    A. Gilmore

Authors
  1. Chulhee Kim
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  2. S.-L. Kim
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  3. Y.-B. Jeon
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  4. C.-H. Kim
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  5. A. Gilmore
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Correspondence to Chulhee Kim.

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Kim, C., Kim, SL., Jeon, YB. et al. A study on the O–C diagram and pulsation behaviour of KZ Hydra. Astrophys Space Sci 312, 41–46 (2007). https://doi.org/10.1007/s10509-007-9610-9

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  • DOI: https://doi.org/10.1007/s10509-007-9610-9

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