Colour magnitude diagram of the full GALAH+TGAS sample coloured by the parallax precision. The colour index is J − KS from 2MASS photometry and absolute magnitude for KS, inferred from 2MASS as well as distances Dϖ and extinction AK. A Dartmouth isochrone with age (15 Gyr) and metallicity (+0.56) is shown as white curve. This is used to identify 338 dwarfs with photometry outside of the expected range (above the white curve) for cool single main sequence stars (MKS > 2 mag), here shown in black. The identified stars are all nearby and their reddening is negligible, especially in the infrared. We note that for some stars, possibly mis-identified as binaries, the photometry indicates colour excesses or a pre-main-sequence stage, which is still an important reason to eliminate them from the subsequent analysis, as the pipeline is not adjusted for these stars.
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