The Oef category gathers rapidly rotating and evolved O-stars displaying a centrally reversed He II λ 4686 emission line. The origin of the variability of their photospheric and wind spectral lines is debated, with rotational modulation or pulsations as the main contenders. To shed new light on this question, we analysed high-quality and high-caden...
Arce-Tord, C.Louvet, F.Cortes, P. C.Motte, F.Hull, C. L. H.Gouellec, V. J. M. LeGaray, G.Nony, T.Didelon, P.Bronfman, L.
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It has been proposed that the magnetic field, pervasive in the ISM, plays an important role in the process of massive star formation. To better understand its impact at the pre and protostellar stages, high-angular resolution observations of polarized dust emission toward a large sample of massive dense cores are needed. To this end, we used the At...
