Location of the GB sample stars (red filled circles) in the [3.6]−[8.0] vs. [8.0] colour-magnitude diagram assuming a distance corresponding to the LMC. The boundaries of the locations of the different type of AGB stars (O-rich, C-rich and extreme) as defined by the SAGE project are taken from Blum et al. (2006). In addition, the “evolved stars” in the LMC (plus signs) identified by Gruendl & Chu (2009), and the spectroscopically confirmed C stars (asterisks) from Gruendl et al. (2008) are overplotted.
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