Variability in binary and single red giants
Variable red giants populate several sequences in the period-luminosity plane. Most sequences represent radially pulsating variables, but two sequences show more enigmatic behaviour. Sequence D is populated by stars known as Long Secondary Period Variables (LSPVs). Two forms of variation are evident in their light curves, the first of which is an overtone pulsation lying on one of the shorter-period pulsation sequences. The cause of the Long Secondary Period (LSP) has not yet been successfully...[Show more]
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