Olivier, Enrico A; Wood, Peter R
The presence of a long secondary period (LSP) in the light curves of some local semiregular variables has been known for many years. Furthermore, the LSPs have recently been found in the light curves of approximately 25% of the semiregular variables in the LMC. They typically have a length of ∼500-4000 days, some 5-15 times longer than the primary period. Binarity, pulsation, periodic dust ejection, and rotation have been suggested as the origin of the LSPs. Here we analyze echelle spectra of a...[Show more]
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