Differential interferometry of the rapid rotator Regulus

We analyse interferometric data obtained for Regulus with AMBER (Astronomical Multi-BEam combineR) at high spectral resolution ($\lambda /\delta \lambda \approx 12\, 000$) across the Brγ spectral line. The study of the photocentre displacement allows us to constrain a large number of stellar parameters – equatorial radius Req , equatoria velocity Veq, inclination i, rotation-axis position angle PA...