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The existence of pulsations in HgMn stars is still being debated. To providethe first unambiguous observational detection of pulsations in this class ofchemically peculiar objects, the bright star HD 45975 was monitored for nearlytwo months by the CoRoT satellite. Independent analyses of the light curveprovides evidence of monoperiodic variations with a frequency of 0.7572 c/d anda peak-to-peak amplitude of ~2800 ppm. Multisite, ground-based spectroscopicobservations overlapping the CoRoT observations show the star to be along-period, single-lined binary. Furthermore, with the notable exception ofmercury, they reveal the same periodicity as in photometry in the line momentsof chemical species exhibiting strong overabundances (e.g., Mn and Y). Incontrast, lines of other elements do not show significant variations. As foundin other HgMn stars, the pattern of variability consists in an absorption bumpmoving redwards across the line profiles. We argue that the photometric andspectroscopic changes are more consistent with an interpretation in terms ofrotational modulation of spots at the stellar surface. In this framework, theexistence of pulsations producing photometric variations above the ~50 ppmlevel is unlikely in HD 45975. This provides strong constraints on theexcitation/damping of pulsation modes in this HgMn star.

A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy