Colour ratios of pulsation amplitudes in red giants

Details Colour ratios of pulsation amplitudes in red giants Colour ratios of pulsation amplitudes in red giants

2003-06-04

arxiv.org/abs/astro-ph/0306079v1

Astronomy and Astrophysics

Astrophysics

In "Asteroseismology Across the HR Diagram" (Porto, July 2002), Eds. Thompson M.J., Cunha M.S. and Monteiro M.J.P.F.G. (Kluwer

Scientific paper

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.

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