2010MNRAS.402.1883E

The extraordinary magnetic Ap star HD75049 has been studied with data obtained with the European Southern Observatory Very Large Telescope and 2.2-m telescopes. Direct measurements reveal that the magnetic field modulus at maximum reaches 30kG. The star shows photometric, spectral and magnetic variability with a rotation period of 4.049d. Variations of the mean longitudinal magnetic field can be described to first order by a centred dipole model with an inclination i = 25°, an obliquity β = 60° and a polar field B_p= 42kG. The combination of the longitudinal and surface magnetic field measurements implies a radius of R = 1.7R_☉, suggesting that the star is close to the zero-age main sequence. HD75049 displays moderate overabundances of Si, Ti, Cr, Fe and large overabundances of rare earth elements. This star has the second strongest magnetic field of any main-sequence star after Babcock's star, HD215441, which it rivals.