Colour ratios of pulsation amplitudes in red giants
Astrophysics
2009-09-29 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/0306079,
title = {Colour ratios of pulsation amplitudes in red giants},
author = {J. P. Huber and T. R. Bedding and S. J. O'Toole},
journal= {arXiv preprint arXiv:astro-ph/0306079},
year = {2009}
}
Comments
In "Asteroseismology Across the HR Diagram" (Porto, July 2002), Eds. Thompson M.J., Cunha M.S. and Monteiro M.J.P.F.G. (Kluwer)