author={Michelle M. Dolan and Grant J. Mathews and Doan Duc Lam and Nguyen Quynh Lan and Gregory J. Herczeg and David S. P. Dearborn},
  journal={The Astrophysical Journal},
We have constructed a series of nonrotating quasi-hydrostatic evolutionary models for the M2 Iab supergiant Betelgeuse (α Orionis). Our models are constrained by multiple observed values for the temperature, luminosity, surface composition, and mass loss for this star, along with the parallax distance and high-resolution imagery that determines its radius. We have then applied our best-fit models to analyze the observed variations in surface luminosity and the size of detected surface bright… 
Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
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
Is Betelgeuse the Outcome of a Past Merger?
We explore the possibility that the star α Orionis (Betelgeuse) is the outcome of a merger that occurred in a low-mass-ratio ( 0.07–0.25) binary system some time in the past hundreds of thousands of
The Betelgeuse Project: constraints from rotation
In order to constrain the evolutionary state of the red supergiant Betelgeuse, we have produced a suite of models with ZAMS masses from 15 to 25 Msun in intervals of 1 Msun including the effects of
Thermodynamics of dust condensation around the dimming Betelgeuse
Betelgeuse is one of the brightest red supergiant (RSG) stars because of its proximity to the Solar system. This makes it important when deducing the features and evolutionary phases of RSG stars.
The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA
We observed Betelgeuse using ALMA's extended configuration in band 7 (f~340 GHz, {\lambda}~0.88 mm), resulting in a very high angular resolution of 18 mas. Using a solid body rotation model of the
3D MHD astrospheres: applications to IRC-10414 and Betelgeuse
A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability
A dusty veil shading Betelgeuse during its Great Dimming.
Observations and modelling support a scenario in which a dust clump formed recently in the vicinity of the star, owing to a local temperature decrease in a cool patch that appeared on the photosphere, and suggest that a component of mass loss from red supergiants is inhomogeneous, linked to a very contrasted and rapidly changing photosphere.
An Updated 2017 Astrometric Solution for Betelgeuse
We provide an update for the astrometric solution for the Type II supernova progenitor Betelgeuse using the revised Hipparcos Intermediate Astrometric Data (HIAD) of van Leeuwen, combined with
SOFIA-EXES Observations of Betelgeuse during the Great Dimming of 2019/2020
In 2019 October Betelgeuse began a decline in V-band brightness that went beyond the minimum expected from its quasi-periodic ∼420 day cycle, becoming the faintest in recorded photometric history.
Betelgeuse Just Is Not That Cool: Effective Temperature Alone Cannot Explain the Recent Dimming of Betelgeuse
We present optical spectrophotometry of the red supergiant (RSG) Betelgeuse from 2020 February 15, during its recent unprecedented dimming episode. By comparing this spectrum to stellar atmosphere


A Spatially Resolved, Semiempirical Model for the Extended Atmosphere of α Orionis (M2 Iab)
We have constructed a detailed mean density and temperature model for the extended outer atmosphere of the O-rich supergiant Betelgeuse (α Ori [M2 Iab]), which extends from 1.0 to 10.0 stellar radii.
Giant convection cells in the envelopes of massive red supergiants turn over in a time comparable in order of magnitude with the observed long secondary periods in these stars, according to a theory
s-Process Elements in the M Supergiant α Ori
The surface structure and linib-darkening profile of Betelgeuse
We present the first resolved image of a star observed with a separated-element optical aperture synthesis telescope. Observations of the M2 lab supergiant Betelgeuse (a Orionis) were made at 830 nm
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER
Context. Aims. We present spatially resolved high-spectral resolution K-band observations of the red supergiant Betelgeuse (α Ori) using AMBER at the Very Large Telescope Interferometer (VLTI). Our
Periodic photospheric and chromospheric modulation in Alpha Orionis (Betelgeuse)
The bright cool supergiant Alpha Orionis has been monitored spectroscopically and photometrically over the past three years (1984-1986) in the optical and the ultraviolet wavelength regions. A
Modeling the Variable Chromosphere of α Orionis
A spectral analysis of the prototypical red supergiant star α Ori that is based on near-UV, optical, and near-IR high-dispersion spectra obtained between 1992 September and 1999 July with the Space
Spatially Resolved Hubble Space Telescope Spectra of the Chromosphere of α Orionis
Spatially resolved UV spectra of the supergiant α Orionis (Betelgeuse) obtained in 1995 March with the Goddard High Resolution Spectrograph (GHRS) on board the Hubble Space Telescope (HST) show that
Water Vapor on Betelgeuse as Revealed by TEXES High-Resolution 12 μm Spectra
The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged.
Interferometric observations of the supergiant stars α Orionis and α Herculis with FLUOR at IOTA
We report the observations in the K band of the red supergiant star α Orionis and of the bright giant star α Herculis with the FLUOR beamcombiner at the IOTA interferometer. The high quality of the