109 citations · 568 across the 14 of their papers we have counts for
14 papers
Populations of evolved massive binary stars in the Small Magellanic Cloud I: Predictions from detailed evolution models
X. -T. Xu, C. Schürmann, N. Langer +13
Context. The majority of massive stars are born with a close binary companion. How this affects their evolution and fate is still largely uncertain, especially at low metallicity.…
Spindown of massive main sequence stars in the Milky Way
K. Nathaniel, N. Langer, S. Simón-Díaz +3
Context. We need to understand the spin evolution of massive stars to compute their internal rotationally induced mixing processes, isolate effects of close binary evolution, and p…
A model of anisotropic winds from rotating stars for evolutionary calculations
Ben Hastings, Norbert Langer, Joachim Puls
Context: The surface properties of rotating stars can vary from pole to equator, resulting in anisotropic stellar winds which are not included in the currently available evolutiona…
Hubble Space Telescope survey of Magellanic Cloud star clusters. Photometry and astrometry of 113 clusters and early results
A. P. Milone, G. Cordoni, A. F. Marino +29
In the past years, we have undertaken an extensive investigation of LMC and SMC star clusters based on HST data. We present photometry and astrometry of stars in 101 fields observe…
The initial spin distribution of B-type stars revealed by the split main sequences of young star clusters
Chen Wang, Ben Hastings, Abel Schootemeijer +6
Spectroscopic observations of stars in young open clusters have revealed evidence for a dichotomous distribution of stellar rotational velocities, with 10-30% of stars rotating slo…
Massive stars in metal-poor dwarf galaxies are often extreme rotators
Abel Schootemeijer, Danny J. Lennon, Miriam Garcia +3
We probe how common extremely rapid rotation is among massive stars in the early universe by measuring the OBe star fraction in nearby metal-poor dwarf galaxies. We apply a new met…
A census of OBe stars in nearby metal-poor dwarf galaxies reveals a high fraction of extreme rotators
A. Schootemeijer, D. J. Lennon, M. Garcia +3
The Early Universe, together with many nearby dwarf galaxies, is deficient in heavy elements. The evolution of massive stars in such environments is thought to be affected by rotat…
Stellar mergers as the origin of the blue main-sequence band in young star clusters
Chen Wang, Norbert Langer, Abel Schootemeijer +10
Recent high-quality Hubble Space Telescope (HST) photometry shows that the main sequences (MS) stars of young star clusters form two discrete components in the color-magnitude diag…
Detailed models of interacting short-period massive binary stars
K. Sen, N. Langer, P. Marchant +10
About a quarter of massive binary stars undergo mass transfer while both stars burn hydrogen at their cores, first on the thermal and then on the nuclear timescale. The nuclear tim…
A stringent upper limit on Be star fractions produced by binary interaction
B. Hastings, N. Langer, C. Wang +2
Context. Binary evolution can result in fast-rotating stars, predicted to be observable as Be stars, through accretion of angular momentum during mass-transfer phases. Despite nume…
Internal circulation in tidally locked massive binary stars -- Consequences for double black hole formation
Ben Hastings, Norbert Langer, Gloria Koenigsberger
Steady-state circulation currents are predicted in tidally deformed binary stars, which are believed to be progenitors of double black-hole merger events. This work aims to quantit…
Effects of close binary evolution on the main-sequence morphology of young star clusters
Chen Wang, Norbert Langer, Abel Schootemeijer +4
Star clusters are the building blocks of galaxies. They are composed of stars of nearly equal age and chemical composition, allowing us to use them as chronometers and as testbeds…
The Single Star Path to Be Stars
Ben Hastings, Chen Wang, Norbert Langer
Be stars are rapidly rotating B main sequence stars, which show line emission due to an outflowing disc. By studying the evolution of rotating single star models, we can assess the…
Properties of OB star-black hole systems derived from detailed binary evolution models
N. Langer, C. Schürmann, K. Stoll +38
The recent gravitational wave measurements have demonstrated the existence of stellar mass black hole binaries. It is essential for our understanding of massive star evolution to i…