Bernd Freytag

Multi-mode Pulsations in AGB Stars: Insights from 3D RHD CO5BOLD Simulations

Ahmad, Arief; Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2025

• DOI för Multi-mode Pulsations in AGB Stars: Insights from 3D RHD CO5BOLD Simulations
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Dimming events of evolved stars due to clouds of molecular gas: Scenarios based on 3D radiation-hydrodynamics simulations with CO5BOLD

Freytag, Bernd; Höfner, Susanne; Aringer, Bernhard; Chiavassa, Andrea

Ingår i Astronomy and Astrophysics, 2024

• DOI för Dimming events of evolved stars due to clouds of molecular gas: Scenarios based on 3D radiation-hydrodynamics simulations with CO5BOLD
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Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO⁵BOLD RHD simulations

Beguin, E.; Chiavassa, A.; Ahmad, Arief; Freytag, Bernd et al.

Ingår i Astronomy and Astrophysics, 2024

• DOI för Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO⁵BOLD RHD simulations
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Asymmetries in asymptotic giant branch stars and their winds: I. From 3D RHD models to synthetic observables

Wiegert, Joachim; Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2024

• DOI för Asymmetries in asymptotic giant branch stars and their winds: I. From 3D RHD models to synthetic observables
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Simulating small-scale dynamo action in cool main-sequence stars

Riva, Fabio; Steiner, Oskar; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2024

• DOI för Simulating small-scale dynamo action in cool main-sequence stars
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Multi-mode Pulsations in AGB Stars: Insights from 3D RHD CO5BOLD Simulations

Ahmad, Arief; Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2025

• DOI för Multi-mode Pulsations in AGB Stars: Insights from 3D RHD CO5BOLD Simulations
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Dimming events of evolved stars due to clouds of molecular gas: Scenarios based on 3D radiation-hydrodynamics simulations with CO5BOLD

Freytag, Bernd; Höfner, Susanne; Aringer, Bernhard; Chiavassa, Andrea

Ingår i Astronomy and Astrophysics, 2024

• DOI för Dimming events of evolved stars due to clouds of molecular gas: Scenarios based on 3D radiation-hydrodynamics simulations with CO5BOLD
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Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO⁵BOLD RHD simulations

Beguin, E.; Chiavassa, A.; Ahmad, Arief; Freytag, Bernd et al.

Ingår i Astronomy and Astrophysics, 2024

• DOI för Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO⁵BOLD RHD simulations
• Ladda ner fulltext (pdf) av Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO⁵BOLD RHD simulations

Asymmetries in asymptotic giant branch stars and their winds: I. From 3D RHD models to synthetic observables

Wiegert, Joachim; Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2024

• DOI för Asymmetries in asymptotic giant branch stars and their winds: I. From 3D RHD models to synthetic observables
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Simulating small-scale dynamo action in cool main-sequence stars

Riva, Fabio; Steiner, Oskar; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2024

• DOI för Simulating small-scale dynamo action in cool main-sequence stars
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A new dimension in the variability of AGB stars: Convection patterns size changes with pulsation

Rosales-Guzmán, A.; Sanchez-Bermudez, J.; Paladini, C.; Freytag, Bernd et al.

Ingår i Astronomy and Astrophysics, 2024

• DOI för A new dimension in the variability of AGB stars: Convection patterns size changes with pulsation
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Is Betelgeuse Really Rotating?: Synthetic ALMA Observations of Large-scale Convection in 3D Simulations of Red Supergiants

Ma, Jing-Ze; Chiavassa, Andrea; de Mink, Selma E.; Valli, Ruggero et al.

Ingår i Astrophysical Journal Letters, 2024

• DOI för Is Betelgeuse Really Rotating?: Synthetic ALMA Observations of Large-scale Convection in 3D Simulations of Red Supergiants
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Properties of self-excited pulsations in 3D simulations of AGB stars and red supergiants

Ahmad, A.; Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2023

• DOI för Properties of self-excited pulsations in 3D simulations of AGB stars and red supergiants
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Effects of magnetic fields on the center-to-limb variation in solar-type stars

Ludwig, H. -G; Steffen, M.; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2023

• DOI för Effects of magnetic fields on the center-to-limb variation in solar-type stars
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Global 3D radiation-hydrodynamical models of AGB stars with dust-driven winds

Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2023

• DOI för Global 3D radiation-hydrodynamical models of AGB stars with dust-driven winds
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Probing red supergiant dynamics through photo-center displacements measured by Gaia

Chiavassa, A.; Kudritzki, R.; Davies, B.; Freytag, Bernd et al.

Ingår i Astronomy and Astrophysics, 2022

• DOI för Probing red supergiant dynamics through photo-center displacements measured by Gaia
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The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE star

Chiavassa, A.; Kravchenko, K.; Montarges, M.; Millour, F. et al.

Ingår i Astronomy and Astrophysics, 2022

• DOI för The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE star
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Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography

Kravchenko, K.; Jorissen, A.; Van Eck, S.; Merle, T. et al.

Ingår i Astronomy and Astrophysics, 2021

• DOI för Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
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Spatially resolved spectroscopy across stellar surfaces: V. Observational prospects: toward Earth-like exoplanet detection

Dravins, Dainis; Ludwig, Hans-Guenter; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2021

• DOI för Spatially resolved spectroscopy across stellar surfaces: V. Observational prospects: toward Earth-like exoplanet detection

Spatially resolved spectroscopy across stellar surfaces IV. F, G, and K-stars: Synthetic 3D spectra at hyper-high resolution

Dravins, Dainis; Ludwig, Hans-Guenter; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2021

• DOI för Spatially resolved spectroscopy across stellar surfaces IV. F, G, and K-stars: Synthetic 3D spectra at hyper-high resolution

Horizontal spreading of planetary debris accreted by white dwarfs

Cunningham, Tim; Tremblay, Pier-Emmanuel; Bauer, Evan B.; Toloza, Odette et al.

Ingår i Monthly notices of the Royal Astronomical Society, s. 1646-1667, 2021

• DOI för Horizontal spreading of planetary debris accreted by white dwarfs

3D spectroscopic analysis of helium-line white dwarfs

Cukanovaite, Elena; Tremblay, Pier-Emmanuel; Bergeron, Pierre; Freytag, Bernd et al.

Ingår i Monthly notices of the Royal Astronomical Society, s. 5274-5293, 2021

• DOI för 3D spectroscopic analysis of helium-line white dwarfs

Tomography of cool giant and supergiant star atmospheres: III. Validation of the method on VLTI/AMBER observations of the Mira star S Ori

Kravchenko, Kateryna; Wittkowski, Markus; Jorissen, Alain; Chiavassa, Andrea et al.

Ingår i Astronomy and Astrophysics, 2020

• DOI för Tomography of cool giant and supergiant star atmospheres: III. Validation of the method on VLTI/AMBER observations of the Mira star S Ori

Optical interferometry and Gaia measurement uncertainties reveal the physics of asymptotic giant branch stars

Chiavassa, A.; Kravchenko, K.; Millour, F.; Schaefer, G. et al.

Ingår i Astronomy and Astrophysics, 2020

• DOI för Optical interferometry and Gaia measurement uncertainties reveal the physics of asymptotic giant branch stars
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VLTI-PIONIER imaging of the red supergiant V602 Carinae

Climent, J. B.; Wittkowski, M.; Chiavassa, A.; Baron, F. et al.

Ingår i Astronomy and Astrophysics, 2020

• DOI för VLTI-PIONIER imaging of the red supergiant V602 Carinae

Tomography of cool giant and supergiant star atmospheres II: Signature of convection in the atmosphere of the red supergiant star mu Cep

Kravchenko, K.; Chiavassa, A.; Van Eck, S.; Jorissen, A. et al.

Ingår i Astronomy and Astrophysics, 2019

• DOI för Tomography of cool giant and supergiant star atmospheres II: Signature of convection in the atmosphere of the red supergiant star mu Cep

Calibration of the mixing-length theory for structures of helium-dominated atmosphere white dwarfs

Cukanovaite, E.; Tremblay, P-E; Freytag, Bernd; Ludwig, H-G et al.

Ingår i Monthly notices of the Royal Astronomical Society, s. 1010-1025, 2019

• DOI för Calibration of the mixing-length theory for structures of helium-dominated atmosphere white dwarfs

Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs

Cunningham, Tim; Tremblay, Pier-Emmanuel; Freytag, Bernd; Ludwig, Hans-Guenter et al.

Ingår i Monthly notices of the Royal Astronomical Society, s. 2503-2522, 2019

• DOI för Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs
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Exploring the origin of clumpy dust clouds around cool giants: A global 3D RHD model of a dust-forming M-type AGB star

Höfner, Susanne; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2019

• DOI för Exploring the origin of clumpy dust clouds around cool giants: A global 3D RHD model of a dust-forming M-type AGB star

Spectroscopic properties of a two-dimensional time-dependent Cepheid model II. Determination of stellar parameters and abundances

Vasilyev, V.; Ludwig, H. -G; Freytag, Bernd; Lemasle, B. et al.

Ingår i Astronomy and Astrophysics, 2018

• DOI för Spectroscopic properties of a two-dimensional time-dependent Cepheid model II. Determination of stellar parameters and abundances

Heading Gaia to measure atmospheric dynamics in AGB stars

Chiavassa, A.; Freytag, Bernd; Schultheis, M.

Ingår i Astronomy and Astrophysics, 2018

• DOI för Heading Gaia to measure atmospheric dynamics in AGB stars
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Using the CIFIST grid of CO5BOLD 3D model atmospheres to study the effects of stellar granulation on photometric colours: I. Grids of 3D corrections in the UBVRI, 2MASS, HIPPARCOS, Gaia, and SDSS systems

Bonifacio, P.; Caffau, E.; Ludwig, H. -G; Steffen, M. et al.

Ingår i Astronomy and Astrophysics, 2018

• DOI för Using the CIFIST grid of CO5BOLD 3D model atmospheres to study the effects of stellar granulation on photometric colours: I. Grids of 3D corrections in the UBVRI, 2MASS, HIPPARCOS, Gaia, and SDSS systems

Atmospheres and wind properties of non-spherical AGB stars

Liljegren, Sofie; Höfner, Susanne; Freytag, Bernd; Bladh, Sara

Ingår i Astronomy and Astrophysics, 2018

• DOI för Atmospheres and wind properties of non-spherical AGB stars

Pure-helium 3D model atmospheres of white dwarfs

Cukanovaite, E.; Tremblay, P. -E; Freytag, Bernd; Ludwig, H. -G et al.

Ingår i Monthly notices of the Royal Astronomical Society, s. 1522-1537, 2018

• DOI för Pure-helium 3D model atmospheres of white dwarfs

Simulation of the small-scale magnetism in main-sequence stellar atmospheres

Salhab, R. G.; Steiner, O.; Berdyugina, S. V.; Freytag, Bernd et al.

Ingår i Astronomy and Astrophysics, 2018

• DOI för Simulation of the small-scale magnetism in main-sequence stellar atmospheres

Tomography of cool giant and supergiant star atmospheres: I. Validation of the method

Kravchenko, K.; Van Eck, S.; Chiavassa, A.; Jorissen, A. et al.

Ingår i Astronomy and Astrophysics, 2018

• DOI för Tomography of cool giant and supergiant star atmospheres: I. Validation of the method

Large granulation cells on the surface of the giant star π¹ Gruis

Paladini, C.; Baron, F.; Jorissen, A.; Le Bouquin, J. -B et al.

Ingår i Nature, s. 310-+, 2018

• DOI för Large granulation cells on the surface of the giant star π¹ Gruis

Using CO5BOLD models to predict the effects of granulation on colours .

Bonifacio, P.; Caffau, E.; Ludwig, H. -G; Steffen, M. et al.

Ingår i MEMORIE della Società Astronomica Italiana, 2017

Convective overshoot and metal accretion onto white dwarfs.

Tremblay, P. -E; Ludwig, H. -G; Freytag, Bernd; Koester, D. et al.

Ingår i MEMORIE della Società Astronomica Italiana, s. 104, 2017

Boundary conditions in CO5BOLD

Freytag, Bernd

Ingår i MEMORIE della Società Astronomica Italiana, s. 12-21, 2017

Global 3D radiation-hydrodynamics models of AGB stars: Effects of convection and radial pulsations on atmospheric structures

Freytag, Bernd; Liljegren, Sofie; Höfner, Susanne

Ingår i Astronomy and Astrophysics, 2017

• DOI för Global 3D radiation-hydrodynamics models of AGB stars: Effects of convection and radial pulsations on atmospheric structures

Spectroscopic properties of a two-dimensional time-dependent Cepheid model

Vasilyev, V.; Ludwig, H. -G; Freytag, Bernd; Lemasle, B. et al.

Ingår i Astronomy and Astrophysics, 2017

• DOI för Spectroscopic properties of a two-dimensional time-dependent Cepheid model

Near-infrared spectro-interferometry of Mira variables and comparisons to 1D dynamic model atmospheres and 3D convection simulations

Wittkowski, M.; Chiavassa, A.; Freytag, Bernd; Scholz, M. et al.

Ingår i Astronomy and Astrophysics, 2016

• DOI för Near-infrared spectro-interferometry of Mira variables and comparisons to 1D dynamic model atmospheres and 3D convection simulations

Application Of A Theory And Simulation-Based Convective Boundary Mixing Model For AGB Star Evolution And Nucleosynthesis

Battino, U.; Pignatari, M.; Ritter, C.; Herwig, F. et al.

Ingår i Astrophysical Journal, 2016

• DOI för Application Of A Theory And Simulation-Based Convective Boundary Mixing Model For AGB Star Evolution And Nucleosynthesis

Non-magnetic photospheric bright points in 3D simulations of the solar atmosphere

Calvo, F.; Steiner, O.; Freytag, Bernd

Ingår i Astronomy and Astrophysics, 2016

• DOI för Non-magnetic photospheric bright points in 3D simulations of the solar atmosphere

Calibration of the Mixing-Length Theory for Convective White Dwarf Envelopes

Tremblay, P. -E; Ludwig, H. -G; Freytag, Bernd; Fontaine, G. et al.

Ingår i Astrophysical Journal, 2015

• DOI för Calibration of the Mixing-Length Theory for Convective White Dwarf Envelopes

What causes the large extensions of red supergiant atmospheres?: Comparisons of interferometric observations with 1D hydrostatic, 3D convection, and 1D pulsating model atmospheres

Arroyo-Torres, B.; Wittkowski, M.; Chiavassa, A.; Scholz, M. et al.

Ingår i Astronomy and Astrophysics, 2015

• DOI för What causes the large extensions of red supergiant atmospheres?: Comparisons of interferometric observations with 1D hydrostatic, 3D convection, and 1D pulsating model atmospheres

On The Evolution Of Magnetic White Dwarfs

Tremblay, P. -E; Fontaine, G.; Freytag, Bernd; Steiner, O. et al.

Ingår i Astrophysical Journal, 2015

• DOI för On The Evolution Of Magnetic White Dwarfs
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3D Model Atmospheres for Extremely Low-Mass White Dwarfs

Tremblay, P. -E; Gianninas, A.; Kilic, M.; Ludwig, H. -G et al.

Ingår i Astrophysical Journal, 2015

• DOI för 3D Model Atmospheres for Extremely Low-Mass White Dwarfs

White Dwarfs in the UKIRT Infrared Deep Sky Survey Data Release 9

Tremblay, P. -E; Leggett, S. K.; Lodieu, N.; Freytag, Bernd et al.

Ingår i Astrophysical Journal, s. 103, 2014

• DOI för White Dwarfs in the UKIRT Infrared Deep Sky Survey Data Release 9

Properties of small-scale magnetism of stellar atmospheres

Steiner, Oskar; Salhab, Rene; Freytag, Bernd; Rajaguru, Paul et al.

Ingår i Nippon Tenmon Gakkai obun kenkyu hokoku, 2014

• DOI för Properties of small-scale magnetism of stellar atmospheres

Radiative hydrodynamic simulations of red supergiant stars III. Spectro-photocentric variability, photometric variability, and consequences on Gaia measurements

Chiavassa, A.; Pasquato, E.; Jorissen, A.; Sacuto, S. et al.

Ingår i Astronomy and Astrophysics, 2011

• DOI för Radiative hydrodynamic simulations of red supergiant stars III. Spectro-photocentric variability, photometric variability, and consequences on Gaia measurements

Radiative hydrodynamics simulations of red supergiant stars IV. Gray versus non-gray opacities

Chiavassa, A.; Freytag, Bernd; Masseron, T.; Plez, B.

Ingår i Astronomy and Astrophysics, 2011

• DOI för Radiative hydrodynamics simulations of red supergiant stars IV. Gray versus non-gray opacities

Three-dimensional simulations of the atmosphere of an AGB star

Freytag, Bernd; Höfner, Susanne

Ingår i Astronomy and Astrophysics, s. 571-583, 2008

• DOI för Three-dimensional simulations of the atmosphere of an AGB star

The photospheric solar oxygen project - I. Abundance analysis of atomic lines and influence of atmospheric models

Caffau, E.; Ludwig, H. -G.; Steffen, M.; Ayres, T. R. et al.

Ingår i Astronomy and Astrophysics, s. 1031-1046, 2008

• DOI för The photospheric solar oxygen project - I. Abundance analysis of atomic lines and influence of atmospheric models

Hydrodynamic Simulations of He Shell Flash Convection

Herwig, F.; Freytag, Bernd; Hueckstaedt, R. M.; Timmes, F. X.

Ingår i Astrophysical Journal, s. 1057-1074, 2006

• DOI för Hydrodynamic Simulations of He Shell Flash Convection

Carbon monoxide in the solar atmosphere. I. Numerical method and two-dimensional models

Wedemeyer-Böhm, S.; Kamp, I.; Bruls, J.; Freytag, Bernd

Ingår i Astronomy and Astrophysics, s. 1043-1057, 2005

• DOI för Carbon monoxide in the solar atmosphere. I. Numerical method and two-dimensional models

Numerical simulation of the three-dimensional structure and dynamics of the non-magnetic solar chromosphere

Wedemeyer, S.; Freytag, Bernd; Steffen, M.; Ludwig, H. -G et al.

Ingår i Astronomy and Astrophysics, s. 1121-1137, 2004

• DOI för Numerical simulation of the three-dimensional structure and dynamics of the non-magnetic solar chromosphere

3-D hydrodynamic simulations of the solar chromosphere

Wedemeyer, Sven; Freytag, Bernd; Steffen, Matthias; Ludwig, Hans-Günter et al.

Ingår i Astronomical Notes - Astronomische Nachrichten, s. 410-411, 2003

• DOI för 3-D hydrodynamic simulations of the solar chromosphere

Spectroscopic Properties of a Two-Dimensional Cepheid Model

Vasilyev, Valeriy; Ludwig, Hans-Guenter; Freytag, Bernd; Lemasle, Bertrand et al.

Ingår i RR Lyrae 2017 conference - revival of the classical pulsators, s. 222-226, 2018

VLTI/AMBER Studies of the Atmospheric Structure and Fundamental Parameters of Red Giant and Supergiant Stars

Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Abellan, F. J. et al.

Ingår i WHY GALAXIES CARE ABOUT AGB STARS III, s. 91-96, 2015

Calibration of the Mixing-Length Free Parameter for White Dwarf Structures

Tremblay, P. -E; Ludwig, H. -G; Freytag, Bernd; Fontaine, G. et al.

Ingår i 19th European Workshop on White Dwarfs, s. 89-94, 2015

Studying the Generation of Shock Waves in AGB Stars with 3-Dimensional Radiation-Hydrodynamics Simulations

Freytag, Bernd

Ingår i WHY GALAXIES CARE ABOUT AGB STARS III, s. 23-29, 2015

3D Hydrodynamical Simulations of Evolved Stars and Observations of Stellar Surfaces

Chiavassa, A.; Freytag, Bernd

Ingår i WHY GALAXIES CARE ABOUT AGB STARS III, s. 11-21, 2015

Pathways For Observing Stellar Surfaces Using 3D Hydrodynamical Simulations Of Evolved Stars

Chiavassa, A.; Freytag, Bernd

Ingår i Physics Of Evolved Stars, s. 237-242, 2015

• DOI för Pathways For Observing Stellar Surfaces Using 3D Hydrodynamical Simulations Of Evolved Stars

3-D Hydrodynamic Simulation of Convection in A Stars

Kochukhov, Oleg; Freytag, Bernd; Piskunov, Nikolai; Steffen, M.

Ingår i IAUS 239, Convection in Astrophysics, s. 68-70, 2007

• DOI för 3-D Hydrodynamic Simulation of Convection in A Stars

Holistic MHD-Simulation from the Convection Zone to the Chromosphere

Schaffenberger, W.; Wedemeyer-Böhm, S.; Steiner, O.; Freytag, Bernd

Ingår i Solar MHD Theory and Observations, 2006

Simulations of Magnetohydrodynamics and CO Formation from the Convection Zone to the Chromosphere

Wedemeyer-Böhm, S.; Schaffenberger, W.; Steiner, O.; Steffen, M. et al.

Ingår i Chromospheric and Coronal Magnetic Fields, s. 16-1, 2005

Enhanced methods for computing spectra from CO5BOLD models using Linfor3D. Molecular bands in metal-poor stars

Gallagher, A. J.; Steffen, M.; Caffau, E.; Bonifacio, P. et al.

2017