114 citations · 498 across the 26 of their papers we have counts for
17 papers · 1 filter
VLTI-GRAVITY measurements of cool evolved stars: II. Pulsation properties and mass-loss process of the Mira star R Car and the red supergiant VX Sgr
D. Jadlovský, M. Wittkowski, A. Chiavassa +9
The mass-loss process of red supergiant (RSG) and asymptotic giant branch (AGB) stars and its relation to variability are poorly constrained. We study two evolved stars, the Mira-t…
Betelgeuse: Detection of the Expanding Wake of the Companion Star
Andrea K. Dupree, Paul I. Cristofari, Morgan MacLeod +1
Recent analyses conclude that Betelgeuse, a red supergiant star (HD 39801), likely has a companion object with a period of about 2000 days orbiting at only 2.3 stellar radii, deep…
Hidden massive eclipsing binaries in red supergiant systems: The hierarchical triple system KQ Puppis and other candidates
D. Jadlovský, L. Molnár, A. Ercolino +26
The majority of massive stars are part of binary systems that may interact during their evolution. However, not many RSGs are known binaries, and only a few have constrained orbita…
VELOcities of CEpheids (VELOCE) I. High-precision radial velocities of Cepheids
Richard I. Anderson, Giordano Viviani, Shreeya S. Shetye +27
This first VELOCE data release comprises 18,225 high-precision RV measurements of 258 bona fide classical Cepheids on both hemispheres collected mainly between 2010 and 2022, along…
Signatures of convection in the atmospheres of cool evolved stars
Andrea Chiavassa, Kateryna Kravchenko, Jared A. Goldberg
Evolved cool stars of various masses are major cosmic engines, delivering substantial mechanical and radiative feedback to the interstellar medium through strong stellar winds and…
The Great Dimming of Betelgeuse: the photosphere as revealed by tomography over the past 15 years
Daniel Jadlovský, Thomas Granzer, Michael Weber +6
Betelgeuse, a red supergiant star of semi-regular variability, reached a historical minimum brightness in February 2020, known as the Great Dimming. Even though the brightness has…
Tomography of evolved star atmospheres
Kateryna Kravchenko
Cool giant and supergiant stars are among the largest and most luminous stars in the Universe and, therefore, dominate the integrated light of their host galaxies. These stars were…
The effect of winds on atmospheric layers of red supergiants I. Modelling for interferometric observations
G. González-Torà, M. Wittkowski, B. Davies +2
Red supergiants (RSGs) are evolved massive stars in a stage preceding core-collapse supernova. The physical processes that trigger mass loss in their atmospheres are still not full…
The Great Dimming of Betelgeuse: a Surface Mass Ejection (SME) and its Consequences
Andrea K. Dupree, Klaus G. Strassmeier, Thomas Calderwood +7
The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801), underwent a historic optical dimming during 2020 January 27 February 13. Many imaging and spectroscopic observation…
A dusty veil shading Betelgeuse during its Great Dimming
M. Montargès, E. Cannon, E. Lagadec +24
Red supergiants are the most common final evolutionary stage of stars that have initial masses between 8 and 35 times that of the Sun. During this stage, which lasts roughly 100,00…
The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE
A. Chiavassa, K. Kravchenko, M. Montargès +50
Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification. Aims. We aim to spatially resolve t…
Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
K. Kravchenko, A. Jorissen, S. Van Eck +7
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, recentl…
Tomography of cool giant and supergiant star atmospheres III. Validation of the method on VLTI/AMBER observations of the Mira star S Ori
Kateryna Kravchenko, Markus Wittkowski, Alain Jorissen +5
The knowledge of the structure and dynamics of AGB-star atmospheres is crucial to better understand the mass loss. The tomographic method, that relies on the design of spectral mas…
Optical interferometry and Gaia measurement uncertainties reveal the physics of asymptotic giant branch stars
A. Chiavassa, K. Kravchenko, F. Millour +20
Context. Asymptotic giant branch stars are cool luminous evolved stars that are well observable across the Galaxy and populating Gaia data. They have complex stellar surface dynami…
Tomography of cool giant and supergiant star atmospheres II. Signature of convection in the atmosphere of the red supergiant star Cep
K. Kravchenko, A. Chiavassa, S. Van Eck +4
Red supergiants are cool massive stars and are the largest and the most luminous stars in the universe. They are characterized by irregular or semi-regular photometric variations,…
Tomography of the red supergiant star μ Cep
K. Kravchenko, A. Chiavassa, S. Van Eck +3
A tomographic method, aiming at probing velocity fields at depth in stellar atmospheres, is applied to the red supergiant star μ Cep and to snapshots of 3D radiative-hydrodynamics…
Tomography of cool giant and supergiant star atmospheres. I. Validation of the method
K. Kravchenko, S. Van Eck, A. Chiavassa +3
Cool giant and supergiant star atmospheres are characterized by complex velocity fields originating from convection and pulsation processes which are not fully understood yet. The…