8/23/2023 0 Comments Example of a main sequence star![]() Furthermore, two groups of stars (one consisting of slowly rotating, nitrogen-enriched objects and another consisting of rapidly rotating un-enriched objects) cannot be reproduced by our single-star population synthesis.Ĭonclusions. However, the predicted number of rapid rotators with enhanced nitrogen is about twice as large as found observationally. Our simulations reproduce the fraction of stars without significant nitrogen enrichment. The synthesized population is then filtered by the selection effects in the observed sample, to enable a direct comparison between the empirical results and theoretical predictions. We developed a new population-synthesis code, which uses this grid to simulate a large population of stars with masses, ages, and rotational velocity distributions consistent with those from the VLT-FLAMES sample. We calculated a grid of stellar evolution models, using the VLT-FLAMES sample to calibrate some of the uncertain mixing processes. Here we use the sample to provide the first rigorous and quantitative test of the theory of rotational mixing in massive stars. This sample is the first to cover a broad range of projected stellar rotational velocities, with a large enough sample of high quality data to allow for a statistically significant analysis. Nitrogen surface abundances for a large and homogeneous sample of massive B-type stars in the Large Magellanic Cloud (LMC) have recently been obtained by the ESO VLT-FLAMES Survey of Massive Stars. Rotational mixing in massive stars is a widely applied concept, with far-reaching consequences for stellar evolution, nucleosynthesis, and stellar explosions.Īims. ![]() Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAĬontext. 17, 1180 Vienna, AustriaĮ-mail: Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UKĪstrophysics Research Centre, School of Mathematics & Physics, The Queens University of Belfast, Belfast, BT7 1NN, Northern Ireland, UKĪstronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The NetherlandsĪrgelander-Institut für Astronomie der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany University of Vienna, Department of Astronomy, Türkenschanzstr. Anders 1Īstronomical Institute, Utrecht University, PrincetonplCC Utrecht, The Netherlands
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