Connection between the long secondary period and red giant evolution

The mechanism behind the Long Secondary Period (LSP) observed in pulsating red giants still remains unknown. In this work, I investigate connection between Red Giant Branch and Asymptotic evolution appearance of LSP - phenomenon a large fraction giants. use OGLE-III sample OSARG variables Large Magellanic Cloud. construct density maps period-luminosity as well color-magnitude planes for stars showing compare them to remaining also fit spectral energy distribution test whether an additional source reddening is present stars. post hypothesis that may be related transition different pulsation sequences. show overabundance Variables can around Tip Branch, much more prominently, at upper part Branch. main over-density region appears slightly fainter redder than bulk It seems correspond area Hertzsprung-Russell diagram where stable winds high mass loss are present. possibly recurring appearing disappearing various points giant evolution. appear reddened other giants, which suggests intrinsic nature reddening, likely dust emission. analysis confirms there relation due presence strong stellar wind LSP.