2003/06/04 by J. P. Huber, J. Huber, Huber, J. P. +5
Physics and Astronomy · #Astronomy and Astrophysical Research #History and Developments in Astronomy #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0306079
In "Asteroseismology Across the HR Diagram" (Porto, July 2002), Eds. Thompson M.J., Cunha M.S. and Monteiro M.J.P.F.G. (Kluwer)
arxiv created 2003/06/04 · arxiv updated 2009/12/01
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 by any theory that attempts to explain LSPs.