Fig. 7.
Classification of the AGB candidates in this work based on the VISTA Ks band and Gaia DR2 photometry (Lebzelter et al. 2018). The solid line indicates the separation between oxygen-rich (O) stars (to the left of the curve) and C stars, while the dashed line separates C stars from the most extreme dust-enshrouded stars. All the stars are colour-coded according to their (J − K) colours.
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