2002/09/25 by Timothy R. Bedding
Physics and Astronomy · #astro-ph
published as Astrophys.Space Sci. 284 (2003) 61-64 · To appear in "Asteroseismology Across the HR Diagram" (Porto, July 2002), Eds. Thompson M.J., Cunha M.S. and Monteiro M.J.P.F.G. (Kluwer); corrected typo in first reference
arxiv created 2002/09/25 · arxiv updated 2009/12/01
Power spectra of the light curves of semiregular variables, based on visual magnitude estimates spanning many decades, show clear evidence for stochastic excitation. This supports the suggestion by Christensen-Dalsgaard et al. (2001) that oscillations in these stars are solar-like, i.e., stochastically excited by convection, with mode lifetimes ranging from years to decades.