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The magnetic chemically peculiar (mCP) stars of the upper main sequence areperfectly suited to studying the effects of rotation, diffusion, mass-loss,accretion, and pulsation in the presence of an organized stellar magneticfield. Therefore, many important models can only be tested with this stargroup. In this case study we investigate the possibility of detecting thecharacteristic 520 nm flux depression of mCP stars using low-resolution BP/RPspectra of the Gaia mission. This would enable us to effectively search forthese objects in the ever-increasing database. We employed the tool of Delta aphotometry to trace the 520 nm flux depression for 1240 known mCP and 387normal-type objects including binaries. To this end, we folded the filtercurves with the BP/RP spectra and generated the well-established color-colordiagram. It is clearly possible to distinguish mCP stars from normal-typeobjects. The detection rate is almost 95\% for B- and A-type objects. It thendrops for cooler-type stars, which is in line with models of the 520 nm fluxdepression. The BP/RP spectra are clearly qualified to efficiently search forand detect mCP stars.

The detection of magnetic chemically peculiar stars using Gaia BP/RP spectra