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Empirical photometric calibration of the <i>Gaia </i>red clump: Colours, effective temperature, and absolute magnitude
Context. Gaia Data Release 1 allows the recalibration of standard candles such as the red clump stars. To use those stars, they first need to be accurately characterised. In particular, colours are needed to derive interstellar extinction. As no filter is available for the first Gaia data release and to …