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The mass of the very massive binary WR21a
F. Tramper, H. Sana, N. E. Fitzsimons +4
We present multi-epoch spectroscopic observations of the massive binary system WR21a, which include the January 2011 periastron passage. Our spectra reveal multiple SB2 lines and f…
Discovery of the massive overcontact binary VFTS 352: Evidence for enhanced internal mixing
L. A. Almeida, H. Sana, S. E. de Mink +15
The contact phase expected to precede the coalescence of two massive stars is poorly characterized due to the paucity of observational constraints. Here we report on the discovery…
B fields in OB stars (BOB): low-resolution FORS2 spectropolarimetry of the first sample of 50 massive stars
L. Fossati, N. Castro, M. Schoeller +10
Within the context of the collaboration "B fields in OB stars (BOB)", we used the FORS2 low-resolution spectropolarimeter to search for a magnetic field in 50 massive stars, includ…
B fields in OB stars (BOB): Detection of a strong magnetic field in the O9.7 V star HD54879
N. Castro, L. Fossati, S. Hubrig +14
The number of magnetic stars detected among massive stars is small; nevertheless, the role played by the magnetic field in stellar evolution cannot be disregarded. Links between li…
The VLT-FLAMES Tarantula Survey XXI. Stellar spin rates of O-type spectroscopic binaries
O. H. Ramírez-Agudelo, H. Sana, S. E. de Mink +9
The initial distribution of spin rates of massive stars is a fingerprint of their elusive formation process. It also sets a key initial condition for stellar evolution and is thus…
Massive stars on the verge of exploding: the properties of oxygen sequence Wolf-Rayet stars
F. Tramper, S. M. Straal, D. Sanyal +7
Context. Oxygen sequence Wolf-Rayet (WO) stars represent a very rare stage in the evolution of massive stars. Their spectra show strong emission lines of helium-burning products, i…