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Investigating the Late Stages of Stellar Evolution with Long Period Variables from MACHO and 2MASS

We are re-analyzing the MACHO variable star database to explore the relationships between pulsation, evolution, and mass loss in evolved stars. We will analyze the multi-periodic properties of long period variable (LPV) stars, 50% of which could not be assigned any period in the original analysis. Recent results show that the missing stars may be an important element in understanding the origin of the period-luminosity sequences observed in the LMC. Our goal is to characterize the morphology and periodic properties of these stars, and then use the stars' 2MASS colors along with theoretical isochrones to understand their mass loss and evolution. We will develop a luminosity-independent criteria to classify the LMC LPVs, which can then be applied to Galactic LPVs. This will enable a synthesis of knowledge between LPVs in the LMC and the well-studied Galactic examples.