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The number of known variable stars has increased by several magnitudes overthe last decade, and automated classification routines are becomingincreasingly important to cope with this development. Here we show that the"upside-down CBH variables", which were proposed as a potentially new class ofvariable stars by Heinze et al. (2018) in the ATLAS First Catalogue of VariableStars, are, at least to a high percentage, made up of alpha2 Canum Venaticorum(ACV) variables - that is, photometrically variable magnetic chemicallypeculiar (CP2/He-peculiar) stars - with distinct double-wave light curves.Using suitable selection criteria, we identified 264 candidate ACV variables inthe ATLAS variable star catalogue. 62 of these objects were spectroscopicallyconfirmed with spectra from the Large Sky Area Multi-Object Fiber SpectroscopicTelescope (all new discoveries except for nine stars) and classified on the MKsystem. The other 202 stars are here presented as ACV star candidates thatrequire spectroscopic confirmation. The vast majority of our sample of starsare main-sequence objects. Derived masses range from 1.4M(Sun) to 5M(Sun), withhalf our sample stars being situated in the range from 2 M(Sun) to 2.4 M(Sun),in good agreement with the spectral classifications. Most stars belong to thethin or thick disk; four objects, however, classify as members of the halopopulation. With a peak magnitude distribution at around 14th magnitude, thehere presented stars are situated at the faint end of the known Galactic mCPstar population. Our study highlights the need to consider rare variabilityclasses, like ACV variables, in automated classification routines.

New magnetic chemically peculiar stars and candidates in the ATLAS First Catalog of Variable Stars