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The advent of space-based photometry provides the opportunity for the firstprecise characterizations of variability in Mercury-Manganese (HgMn/CP3) stars,which might advance our understanding of their internal structure. We havecarried out a spectroscopic and photometric investigation of the candidate CP3star KIC 6128830. A detailed abundance analysis based on newly-acquiredhigh-resolution spectra was performed, which confirms that the star's abundancepattern is fully consistent with its proposed classification. Photometricvariability was investigated using four years of archival Kepler data. Inagreement with results from the literature, we have identified a singlesignificant and independent frequency $f_1$=0.2065424 d$^{-1}$ with apeak-to-peak amplitude of $\sim$3.4 mmag and harmonic frequencies up to $5f_1$.Drawing on the predictions of state-of-the-art pulsation models and informationon evolutionary status, we discuss the origin of the observed light changes.Our calculations predict the occurrence of g-mode pulsations at the observedvariability frequency. On the other hand, the strictly mono-periodic nature ofthe variability strongly suggests a rotational origin. While we prefer therotational explanation, the present data leave some uncertainty.

A Spectroscopic and Photometric Investigation of the Mercury-Manganese Star KIC 6128830