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A longitudinal magnetic field with a strength of 5.2kG was recently detectedin CPD -62 2124, which has a fractional main-sequence lifetime of about 60%.Strongly magnetic early-B type chemically peculiar stars in an advancedevolutionary state are of special interest to understand the evolution of theangular momentum and spin-down timescales in the presence of a global magneticfield. We exploited 17 FORS2 low-resolution spectropolarimetric observationsand 844 ASAS3 photometric measurements for the determination of the rotationperiod, pulsations, and the magnetic field geometry of the star. We calculatedperiodograms and applied phenomenological models of photometric, spectral andspectropolarimetric variability. We found that all quantities studied,specifically equivalent widths, the mean longitudinal magnetic field <B_z>, andthe flux in the V filter, vary with the same period P = 2.628d, which wasidentified as the rotation period. The observed variations can be fullyexplained by a rigidly rotating main-sequence star with an uneven distributionof chemical elements, photometric spots, and a stable, nearly dipolar magneticfield with a polar field strength of about 21kG, frozen into the body of thestar. The magnetic field of CPD -62 2124 is tilted to the rotation axis bybeta=28+-7deg, while the inclination of the rotation axis towards the line ofsight is only i=20+-5deg. In the acquired FORS2 spectra, we detect short-termline profile variations indicating the presence of beta Cephei type pulsations.As of today, no other pulsating star of this type is known to possess such astrong magnetic field.

Rotationally modulated variability and pulsations of the He-rich star CPD -62 2124 with an extraordinarily strong magnetic field