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Orbital and physical properties of the Ori Aa,Ab,B triple system
Simón-Díaz, J. A. Caballero, J. Lorenzo +11
We provide a complete characterization of the astrophysical properties of the Ori Aa,Ab,B hierarchical triple system, and an improved set of orbital parameters for the highly e…
The occurrence of classical Cepheids in binary systems
Hilding R. Neilson, Fabian R. N. Schneider, Robert G. Izzard +2
Classical Cepheids, like binary stars, are laboratories for stellar evolution and Cepheids in binary systems are especially powerful ones. About one-third of Galactic Cepheids are…
B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars beta CMa and epsilon CMa
L. Fossati, N. Castro, T. Morel +15
Within the context of the "B fields in OB stars (BOB)" collaboration, we used the HARPSpol spectropolarimeter to observe the early B-type stars beta CMa (HD44743; B1 II/III) and ep…
The spectroscopic Hertzsprung-Russell diagram of Galactic massive stars
N. Castro, L. Fossati, N. Langer +3
The distribution of stars in the Hertzsprung-Russell diagram narrates their evolutionary history and directly assesses their properties. Placing stars in this diagram however requi…
Numerical Tests of Rotational Mixing in Massive Stars with the new Population Synthesis Code BONNFIRES
Herbert H. B. Lau, Robert G. Izzard, Fabian R. N. Schneider
We use our new population synthesis code BONNFIRES to test how surface abundances predicted by rotating stellar models depend on the numerical treatment of rotational mixing, such…
Two spotted and magnetic early B-type stars in the young open cluster NGC2264 discovered by MOST and ESPaDOnS
L. Fossati, K. Zwintz, N. Castro +9
Star clusters are known as superb tools for understanding stellar evolution. In a quest for understanding the physical origin of magnetism and chemical peculiarity in about 7% of t…