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The massive binary population of the starburst cluster Westerlund 1
The massive binary population the starburst cluster Westerlund 1
2011/1/13
We present initial results from a long-baseline radial velocity survey for massive binaries in the cluster Westerlund 1. Four systems are examined: the dust-producing WC binary W239, the double-lined...
We present a study of the radio emission from a massive runaway star. The star forms a bow shock that is clearly observed in the infrared. We have performed VLA observations under the assumption that ...
Thin shell morphology in the circumstellar medium of massive binaries
Hydrodynamics – Stars binaries general – Stars circumstellar matter – Stars massive – Stars winds outflows
2010/11/11
Context. In massive binaries, the powerful stellar winds of the two stars collide, leading to the formation of shock-dominated environments that can be modelled only in 3D.
Circumstellar Material Around Evolved Massive Stars
Solar and Stellar Astrophysics (astro-ph.SR) High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/7
I review multiwavelength observations of material seen around different types of evolved massive stars (i.e. red supergiants, yellow hypergiants, luminous blue variables, B[e] supergiants, and Wolf-Ra...
Evolution of massive Be and Oe stars at low metallicity towards the Long Gamma Ray bursts\footnote{Based on ESO runs 069.D-0275(A), 072.D-0245(A) and (C).}
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Several studies have shown recently that at low metallicity B-type stars rotate faster than in environments of high metallicity. This is a typical case in the SMC. As a consequence, it is expected tha...
The evolution of massive binaries in a dense stellar cluster environment
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Massive stars are among the most important objects in the Universe and many (most?) of them are formed in binaries. A selection of observational and theoretical facts that illustrate the importance of...
Massive Oe/Be stars at low metallicity: Candidate progenitors of long GRBs?
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
At low metallicity the B-type stars rotate faster than at higher metallicity, typically in the SMC. As a consequence, it was expected a larger number of fast rotators in the SMC than in the Galaxy, in...
Signatures of binary evolution processes in massive stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Before binary components interact, they evolve as single stars do. We therefore first critically discuss massive single star processes which affect their evolution, stellar wind mass loss and rotation...
High Velocity Molecular Outflows In Massive Cluster Forming Region G10.6-0.4
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/4
We report the arcsecond resolution SMA observations of the $^{12}$CO (2-1) transition in the massive cluster forming region G10.6-0.4. In these observations, the high velocity $^{12}$CO emission is re...
Turbulence and magnetic spots at the surface of hot massive stars
Solar and Stellar Astrophysics (astro-ph.SR) Fluid Dynamics (physics.flu-dyn)
2010/12/29
Hot luminous stars show a variety of phenomena in their photospheres and in their winds which still lack clear physical explanations at this time. Among these phenomena are non-thermal line broadening...
The Decrease of Specific Angular Momentum and the Hot Toroid Formation: The Massive Clump G10.6-0.4
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
This is the first paper of our series of high resolution (1") studies of the massive star forming region G10.6--0.4. We present the emission line observations of the hot core type tracers (O$^{13}$CS,...
Magnetic fields, winds and X-rays of the massive stars in the Orion Nebula Cluster
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
In some massive stars, magnetic fields are thought to confine the outflowing radiatively-driven wind. Although theoretical models and MHD simulations are able to illustrate the dynamics of such a magn...
HerMES : SPIRE detection of high redshift massive compact galaxies in GOODS-N field
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
We have analysed the rest-frame far infrared (FIR) properties of a sample of massive (Mstar > 10^11Msun) galaxies at 2servatories Origins Deep Survey) North field using the ...