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Wind modelling of very massive stars up to 300 solar masses
The stellar upper-mass limit is highly uncertain. Some studies have claimed there is a universal upper limit of ∼150 M� . A factor that is often overlooked is that there might be a significantExpand
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Predictions for mass-loss rates and terminal wind velocities of massive O-type stars
Context. Mass loss from massive stars forms an important aspect of the evolution of massive stars, as well as for the enrichment of the surrounding interstellar medium. Aims. Our goal is to predictExpand
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Predictions of the effect of clumping on the wind properties of O-type stars
Aims. Both empirical evidence and theoretical findings indicate that the stellar winds of massive early-type stars are inhomogeneous, i.e., porous and clumpy. For relatively dense winds, empiricallyExpand
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The influence of inhomogeneities on hot star wind model predictions
We study the effect of wind inhomogeneities (clumping) on O star wind model predictions. For this purpose we artificially include clumping into our stationary NLTE wind models. As a result of theExpand
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Mass-loss predictions for evolved very metal-poor massive stars
Context. The first couple of stellar generations may have been massive, of order 100 M� , and to have played a dominant role in galaxy formation and the chemical enrichment of the early Universe.Expand
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Sparse Aperture Masking of Massive Stars
We present the earliest results of our NACO/VLT sparse aperture masking (SAM) campaign to search for binarity in a sample of 60 O-type stars. We detect Delta Ks < 5 mag companions for 20-25% of ourExpand
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Constraints on wind clumping from the empirical mass-loss vs. metallicity relation for early-type stars
We present the latest results on the observational dependence of the mass-loss rate in stellar winds of O and early-B stars on the metal content of their atmospheres, and compare these withExpand
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The effect of clumping on predictions of the mass-loss rate of early-type stars
Massive stars in our galaxy lose a significant amount of mass through radiation‐driven stellar winds. This mass loss influences the course of their evolution, determines the type of supernovaExpand
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UvA-DARE ( Digital Academic Repository ) Predictions of the effect of clumping on the wind properties of O-type stars
Aims. Both empirical evidence and theoretical findings indicate that the stellar winds of massive early-type stars are inhomogeneous, i.e., porous and clumpy. For relatively dense winds, empiricallyExpand
The physics of line-driven winds of hot massive stars
De zwaarste sterren in de Melkweg en de ons omringende sterrenstelsels zijn 100 tot 150 keer zwaarder dan de zon. Zware sterren hebben gedurende de gehele geschiedenis van het universum eenExpand
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