The rapidly rotating primary component of Regulus A system has been observed, for the first time, using the technique of differential interferometry at high spectral resolution. The observations have been performed across the Brγ spectral line with the VLTI/AMBER focal instrument in high spectral resolution mode (R ≈ 12000) at ≈ 80-130m (projected on the sky) Auxiliary Telescopes triplet baseline configurations. We confirm, within the uncertainties, the results previously obtained using the techniques of classical long-baseline interferometry, although the question of anomalous gravity darkening remains open for the future study.
Cite
@article{arxiv.1712.03584,
title = {Regulus observed with VLTI/AMBER},
author = {S. Jankov and M. Hadjara and R. G. Petrov and P. Cruzalèbes and A. Spang and S. Lagarde},
journal= {arXiv preprint arXiv:1712.03584},
year = {2017}
}