Variable red giants in the LMC: Pulsating stars and binaries

Abstract: Infrared J and K photometry has been obtained of all red giants in the half square degree region of the LMC bar searched for variables using the MACHO database by Wood et al. (1999). The K{logP diagram shows the flve distinct period{luminosity sequences which are also evident in the MACHO photometry. The K{logP plot allows identiflcation of the Mira sequence from among the flve observed sequences. As shown in Wood et al. (1999), comparison of observed periods, luminosities and period ratios with theoretical models identifles Miras unambiguously as radial fundamental mode pulsators, while semi-regular variables can be pulsating in the flrst, second or third overtone, or even the fundamental mode. All these variables lie on just three of the flve distinct sequences, and they all appear to be on the AGB. The nature of the variability of stars on the other two sequences is currently unknown. Possibilities include contact and semi-detached binaries, rotating stars with giant star spots, episodic dust formation, rotationally stabilised non-radial g ¡ modes and strange pulsation modes caused by convection{pulsation interaction. These possibilities are discussed