• Corpus ID: 118188847

Colour ratios of pulsation amplitudes in red giants

@article{Huber2003ColourRO,
  title={Colour ratios of pulsation amplitudes in red giants},
  author={Joseph Huber and Timothy R. Bedding and S. O’Toole},
  journal={arXiv: Astrophysics},
  year={2003}
}
We have analysed the three-colour photometry of 34 pulsating red giants that was published by Percy, Wilson and Henry (2001). As is common with semiregulars, many of these stars have long secondary periods (LSPs) of several years, in addition to the usual shorter-period pulsations. We measured pulsation amplitudes in VRI and found that both the V/R and V/I amplitude ratios in most stars are systematically lower for the LSPs that for the shorter periods. These results must be taken into account… 

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