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  • Heading Gaia to measure atm... Heading Gaia to measure atmospheric dynamics in AGB stars
    Chiavassa, A.; Freytag, B.; Schultheis, M. Astronomy and astrophysics (Berlin), 09/2018, Letnik: 617
    Journal Article
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    Context. Asymptotic giant branch (AGB) stars are characterised by complex stellar surface dynamics that affect the measurements and amplify the uncertainties on stellar parameters. The uncertainties ...
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  • The Mass Function of GX 339... The Mass Function of GX 339–4 from Spectroscopic Observations of Its Donor Star
    Heida, M.; Jonker, P. G.; Torres, M. A. P. ... The Astrophysical journal, 09/2017, Letnik: 846, Številka: 2
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    Abstract We obtained 16 VLT/X-shooter observations of GX 339−4 in quiescence during the period 2016 May–September and detected absorption lines from the donor star in its NIR spectrum. This allows us ...
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  • Planet and star synergy at ... Planet and star synergy at high-spectral resolution. A rationale for the characterization of exoplanet atmospheres
    Chiavassa, A.; Brogi, M. Astronomy and astrophysics (Berlin), 11/2019, Letnik: 631
    Journal Article
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    Context. Spectroscopy of exoplanet atmospheres at high-resolving powers is rapidly gaining popularity for measuring the presence of atomic and molecular species. While this technique is particularly ...
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  • Atmosphere of Betelgeuse be... Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
    Kravchenko, K.; Jorissen, A.; Van Eck, S. ... Astronomy and astrophysics (Berlin), 06/2021, Letnik: 650
    Journal Article
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    Context. Despite being the best studied red supergiant star in our Galaxy, the physics behind the photometric variability and mass loss of Betelgeuse is poorly understood. Moreover, recently the star ...
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  • The Stagger-grid: A grid of... The Stagger-grid: A grid of 3D stellar atmosphere models
    Magic, Z; Chiavassa, A; Collet, R ... Astronomy and astrophysics (Berlin), 1/2015, Letnik: 573
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    Aims. We compute the emergent stellar spectra from the UV to far infrared for different viewing angles using realistic 3D model atmospheres for a large range in stellar parameters to predict the ...
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  • Radiative hydrodynamics sim... Radiative hydrodynamics simulations of red supergiant stars
    Chiavassa, A.; Plez, B.; Josselin, E. ... Astronomy and astrophysics (Berlin), 11/2009, Letnik: 506, Številka: 3
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    Context. It has been proposed that convection in red supergiant (RSG) stars produces large-scale granules causing observable surface inhomogeneities. This convection is also extremely vigorous and is ...
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  • Radiative hydrodynamics sim... Radiative hydrodynamics simulations of red supergiant stars IV. Gray versus non-gray opacities
    CHIAVASSA, A; FREYTAG, B; MASSERON, T ... Astronomy and astrophysics (Berlin), 11/2011, Letnik: 535
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    Context. Red supergiants are massive evolved stars that contribute extensively to the chemical enrichment of our Galaxy. It has been shown that convection in those stars produces large granules that ...
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  • The Stagger-grid: A grid of... The Stagger-grid: A grid of 3D stellar atmosphere models
    Magic, Z; Collet, R; Asplund, M ... Astronomy and astrophysics (Berlin), 9/2013, Letnik: 557
    Journal Article
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    We present the STAGGER-grid, a comprehensive grid of time-dependent, threedimensional (3D), hydrodynamic model atmospheres for late-type stars with realistic treatment of radiative transfer, covering ...
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