Search Results - "Georgy, Cyril"

Is GW190521 the merger of black holes from the first stellar generations? by Farrell, Eoin, Groh, Jose H, Hirschi, Raphael, Murphy, Laura, Kaiser, Etienne, Ekström, Sylvia, Georgy, Cyril, Meynet, Georges

“…ABSTRACT GW190521 challenges our understanding of the late-stage evolution of massive stars and the effects of the pair instability in particular. We discuss…”
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The Time-averaged Mass-loss Rates of Red Supergiants as Revealed by Their Luminosity Functions in M31 and M33 by Massey, Philip, Neugent, Kathryn F., Ekström, Sylvia, Georgy, Cyril, Meynet, Georges

“…Abstract Mass loss in red supergiants (RSGs) is generally recognized to be episodic, but mass-loss prescriptions fail to reflect this. Evolutionary models show…”
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The Luminosity Function of Red Supergiants in M31 by Neugent, Kathryn F., Massey, Philip, Georgy, Cyril, Drout, Maria R., Mommert, Michael, Levesque, Emily M., Meynet, Georges, Ekström, Sylvia

“…The mass-loss rates of red supergiant stars (RSGs) are poorly constrained by direct measurements, and yet the subsequent evolution of these stars depends…”
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Massive Black Holes Regulated by Luminous Blue Variable Mass Loss and Magnetic Fields by Groh, Jose H., Farrell, Eoin J., Meynet, Georges, Smith, Nathan, Murphy, Laura, Allan, Andrew P., Georgy, Cyril, Ekstroem, Sylvia

“…We investigate the effects of mass loss during the main-sequence (MS) and post-MS phases of massive star evolution on black hole (BH) birth masses. We compute…”
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3D Simulations and MLT. I. Renzini's Critique by Arnett, W. David, Meakin, Casey, Hirschi, Raphael, Cristini, Andrea, Georgy, Cyril, Campbell, Simon, Scott, Laura J. A., Kaiser, Etienne A., Viallet, Maxime, Mocák, Miroslav

“…Renzini wrote an influential critique of "overshooting" in mixing-length theory (MLT), as used in stellar evolution codes, and concluded that three-dimensional…”
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Turbulence and nuclear reactions in 3D hydrodynamics simulations of massive stars by Rizzuti, Federico, Hirschi, Raphael, Georgy, Cyril, Arnett, David, Meakin, Casey, Murphy, Alexander

“…Our knowledge of massive star evolution and nucleosynthesis is limited by uncertainties related to multi-dimensional processes taking place in stellar…”
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How rotation affects masses and ages of classical Cepheids by Anderson, Richard I., Ekström, Sylvia, Georgy, Cyril, Meynet, Georges, Saio, Hideyuki

“…Classical Cepheid variable stars are both sensitive astrophysical laboratories and accurate cosmic distance tracers. We have recently investigated how the…”
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Evolution of blue supergiants and α Cygni variables: puzzling CNO surface abundances by Saio, Hideyuki, Georgy, Cyril, Meynet, Georges

“…A massive star can enter the blue supergiant region either by evolving directly from the main sequence, or by evolving from a previous red supergiant stage…”
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The puzzle of the CNO abundances of α Cygni variables resolved by the Ledoux criterion by Georgy, Cyril, Saio, Hideyuki, Meynet, Georges

“…Recent stellar evolution computations show that the blue supergiant (BSG) stars could come from two distinct populations: a first group arising from massive…”
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s-process production in rotating massive stars at solar and low metallicities by Frischknecht, Urs, Hirschi, Raphael, Pignatari, Marco, Maeder, André, Meynet, George, Chiappini, Cristina, Thielemann, Friedrich-Karl, Rauscher, Thomas, Georgy, Cyril, Ekström, Sylvia

“…Rotation was shown to have a strong impact on the structure and light element nucleosynthesis in massive stars. In particular, models including rotation can…”
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Evolution and fate of very massive stars by Yusof, Norhasliza, Hirschi, Raphael, Meynet, Georges, Crowther, Paul A., Ekström, Sylvia, Frischknecht, Urs, Georgy, Cyril, Abu Kassim, Hasan, Schnurr, Olivier

“…There is observational evidence that supports the existence of very massive stars (VMS) in the local universe. First, VMS (M ini 320 M) have been observed in…”
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Relative importance of convective uncertainties in massive stars by Kaiser, Etienne A, Hirschi, Raphael, Arnett, W David, Georgy, Cyril, Scott, Laura J A, Cristini, Andrea

“…ABSTRACT In this work, we investigate the impact of uncertainties due to convective boundary mixing (CBM), commonly called ‘overshoot’, namely the boundary…”
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Grids of stellar models with rotation VII: models from 0.8 to 300 M⊙ at supersolar metallicity (Z = 0.020) by Yusof, Norhasliza, Hirschi, Raphael, Eggenberger, Patrick, Ekström, Sylvia, Georgy, Cyril, Sibony, Yves, Crowther, Paul A, Meynet, Georges, Kassim, Hasan Abu, Harun, Wan Aishah Wan, Maeder, André, Groh, Jose H, Farrell, Eoin, Murphy, Laura

“…ABSTRACT We present a grid of stellar models at supersolar metallicity (Z = 0.020) extending the previous grids of Geneva models at solar and sub-solar…”
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The Formation of the Stripped-envelope Type IIb Supernova Progenitors: Rotation, Metallicity, and Overshooting by Long, Gang, Song, Hanfeng, Meynet, Georges, Maeder, Andre, Zhang, Ruiyu, Qin, Ying, Ekströmt, Sylvia, Georgy, Cyril, Zhao, Liuyan

“…Abstract Type IIb supernovae (SNe) are believed to originate from core-collapse progenitors having kept only a very thin hydrogen envelope. We aim to explore…”
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THE WOLF-RAYET CONTENT OF M31 by NEUGENT, Kathryn F, MASSEY, Philip, GEORCY, Cyril

“…Wolf-Rayet (WR) stars are evolved massive stars, and the relative number of WC-type and WN-type WRs should vary with the metallicity of the host galaxy,…”
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The Energy Transport Induced by Horizontal Turbulence in Rotating W-type W UMa Contact Binaries by Song, Hanfeng, Meynet, Georges, Maeder, Andre, Peng, Weiguo, Long, Gang, Zhang, Ruiyu, Ekström, Sylvia, Georgy, Cyril, Huang, Runqian

“…Abstract The aim of this paper is to investigate the impact of energy transfer on the evolution of contact binaries. Horizontal turbulence is triggered by the…”
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Discovery of magnetic A supergiants: the descendants of magnetic main-sequence B stars by Neiner, Coralie, Oksala, Mary E., Georgy, Cyril, Przybilla, Norbert, Mathis, Stéphane, Wade, Gregg, Kondrak, Matthias, Fossati, Luca, Blazère, Aurore, Buysschaert, Bram, Grunhut, Jason

“…In the context of the high resolution, high signal-to-noise ratio, high sensitivity, spectropolarimetric survey BritePol, which complements observations by the…”
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Grids of stellar models with rotation – V. Models from 1.7 to 120 M⊙ at zero metallicity by Murphy, Laura J, Groh, Jose H, Ekström, Sylvia, Meynet, Georges, Pezzotti, Camila, Georgy, Cyril, Choplin, Arthur, Eggenberger, Patrick, Farrell, Eoin, Haemmerlé, Lionel, Hirschi, Raphael, Maeder, André, Martinet, Sebastién

“…ABSTRACT Understanding the nature of the first stars is key to understanding the early Universe. With new facilities such as James Webb Space Telescope (JWST)…”
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snapshot: connections between internal and surface properties of massive stars by Farrell, Eoin J, Groh, Jose H, Meynet, Georges, Eldridge, J J, Ekström, Sylvia, Georgy, Cyril

“…ABSTRACT We introduce snapshot, a technique to systematically compute stellar structure models in hydrostatic and thermal equilibrium based on three structural…”
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Evolution of blue supergiants and [alpha] Cygni variables: puzzling CNO surface abundances by Saio, Hideyuki, Georgy, Cyril, Meynet, Georges

“…A massive star can enter the blue supergiant region either by evolving directly from the main sequence, or by evolving from a previous red supergiant stage…”
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