Long-Term Changes in the Periods of SX Phe

  title={Long-Term Changes in the Periods of SX Phe},
  author={H. Landes and Keith R. Bambery and Denis W Coates and K. Thompson},
  journal={Publications of the Astronomical Society of Australia},
  pages={41 - 45}
Abstract We have used times of maximum light for SX Phe, obtained by ourselves and other workers over 55 years to study the behaviour of the fundamental and first overtone radial pulsation modes of the star. We find (1/P 0)dP 0/dt to be (+2.53 ± 0.05) × 10−8 yr−1 and (1/P 1)dP 1/dt to be (−1.60 ± 0.03) × 10−7 yr−1, which differ significantly from the value +1.9 × 10−9 yr−1 expected if the changes are due to standard evolution of the star. The residuals in O–C from a quadratic fit cannot be… 
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