E. De Beck
YOU?
Author Swipe
View article: Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2
Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2 Open
Atacama Large Millimeter/submillimeter Array (ALMA) observations at 1.3 mm have recently revealed surprising complexity in the circumstellar environment of DFK 52, a red supergiant (RSG) located in the Stephenson 2 massive open cluster. We…
View article: Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2
Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2 Open
Atacama Large Millimeter/submillimeter Array (ALMA) observations at 1.3mm have recently revealed surprising complexity in the circumstellar environment of DFK 52, a red supergiant (RSG) located in the Stephenson 2 massive open cluster. We …
View article: Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars
Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars Open
Context . The circumstellar envelopes (CSEs) of asymptotic giant branch (AGB) stars harbour a rich variety of molecules and are sites of complex chemistry. Our current understanding of the circumstellar chemical processes of carbon-rich AG…
View article: Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars. II. Abundances and spatial distributions of CS
Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars. II. Abundances and spatial distributions of CS Open
The circumstellar envelopes (CSEs) of asymptotic giant branch (AGB) stars harbour a rich variety of molecules and are sites of complex chemistry. Our current understanding of the circumstellar chemical processes of carbon-rich AGB stars is…
View article: The circumstellar environment around the extreme Galactic red supergiant NML Cygni: Dense, dusty, and asymmetric
The circumstellar environment around the extreme Galactic red supergiant NML Cygni: Dense, dusty, and asymmetric Open
Supernova observations imply the presence of a dense and asymmetric circumstellar environment around SN Type II progenitors, whereas the mass loss from these progenitors, namely, red supergiants, is still poorly constrained. We aim to char…
View article: The circumstellar environment around the extreme Galactic red supergiant NML Cygni: Dense, dusty, and asymmetric
The circumstellar environment around the extreme Galactic red supergiant NML Cygni: Dense, dusty, and asymmetric Open
Context . Supernova observations imply the presence of a dense and asymmetric circumstellar environment around SN Type II progenitors, whereas the mass loss from these progenitors, namely, red supergiants, is still poorly constrained. Aims…
View article: New sub-millimetre HCN lasers in carbon-rich evolved stars
New sub-millimetre HCN lasers in carbon-rich evolved stars Open
Context . Strong laser emission from hydrogen cyanide (HCN) at 805 and 891 GHz has been discovered towards carbon-rich (C-rich) asymptotic giant branch (AGB) stars. Both lines belong to the Coriolis-coupled system between the (1,1 1e ,0) a…
View article: An impressionist view of V Hydrae
An impressionist view of V Hydrae Open
Context. Asymptotic giant branch (AGB) stars enrich the interstellar medium through their mass loss. The mechanism(s) shaping the circumstellar environment of mass-losing stars is not clearly understood so far. Aims. Our purpose is to stud…
View article: An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs
An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs Open
Our purpose is to study the effect of binary companions located within the first 10 stellar radii from the primary AGB star. In this work, we target the mass-losing carbon star V Hydrae (V Hya), looking for signatures of its companion in t…
View article: Probing the dynamical and kinematical structures of detached shells around AGB stars
Probing the dynamical and kinematical structures of detached shells around AGB stars Open
Context. The chemical evolution of asymptotic giant branch (AGB) stars is driven by repeated thermal pulses (TPs). The duration of a TP is only a few hundred years, whereas an inter-pulse period lasts 10 4 − 10 5 yr. Direct observations of…
View article: An empirical view of the extended atmosphere and inner envelope of the asymptotic giant branch star R Doradus
An empirical view of the extended atmosphere and inner envelope of the asymptotic giant branch star R Doradus Open
Context. The mass loss experienced on the asymptotic giant branch (AGB) at the end of the lives of low- and intermediate-mass stars is widely accepted to rely on radiation pressure acting on newly formed dust grains. Dust formation happens…
View article: An empirical view of the extended atmosphere and inner envelope of the AGB star R Doradus I. Physical model based on CO lines
An empirical view of the extended atmosphere and inner envelope of the AGB star R Doradus I. Physical model based on CO lines Open
The mass loss experienced on the asymptotic giant branch (AGB) at the end of the lives of low- and intermediate-mass stars is widely accepted to rely on radiation pressure acting on dust grains formed in the extended AGB atmospheres. The i…
View article: Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars
Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars Open
Context. Asymptotic giant branch (AGB) stars are major contributors to the chemical enrichment of the interstellar medium through nucleosynthesis and extensive mass loss. Direct measures of both processes can be obtained by studying their …
View article: Charting Circumstellar Chemistry of Carbon-rich AGB Stars: I. ALMA 3 mm spectral surveys
Charting Circumstellar Chemistry of Carbon-rich AGB Stars: I. ALMA 3 mm spectral surveys Open
AGB stars are major contributors to the chemical enrichment of the ISM through nucleosynthesis and extensive mass loss. Most of our current knowledge of AGB atmospheric and circumstellar chemistry, in particular in a C-rich environment, is…
View article: Chemical tracers of a highly eccentric binary orbit
Chemical tracers of a highly eccentric binary orbit Open
Binary interactions have been proposed to explain a variety of circumstellar structures seen around evolved stars, including asymptotic giant branch (AGB) stars and planetary nebulae. Studies resolving the circumstellar envelopes of AGB st…
View article: The messy death of a multiple star system and the resulting planetary nebula as observed by JWST
The messy death of a multiple star system and the resulting planetary nebula as observed by JWST Open
Planetary nebulae (PNe), the ejected envelopes of red giant stars, provide us with a history of the last, mass-losing phases of 90 percent of stars initially more massive than the Sun. Here, we analyse James Webb Space Telescope (JWST) Ear…
View article: Distance estimates for AGB stars from parallax measurements
Distance estimates for AGB stars from parallax measurements Open
Context. Estimating the distances to asymptotic giant branch (AGB) stars using optical measurements of their parallaxes is not straightforward because of the large uncertainties introduced by their dusty envelopes, their large angular size…
View article: Investigating dust properties in AGB wind-ISM interaction regions
Investigating dust properties in AGB wind-ISM interaction regions Open
Aims. In this paper, we aim to constrain the dust mass and grain sizes in the interaction regions between the stellar winds and the interstellar medium (ISM) around asymptotic giant branch (AGB) stars. By describing the dust in these regio…
View article: DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars
DEATHSTAR—CO Envelope Size and Asymmetry of Nearby AGB Stars Open
Low- and intermediate-mass stars evolve into asymptotic giant branch (AGB) stars near the end of their lives, losing mass through slow and massive winds. The ejected material creates a chemically-rich expanding envelope around the star, na…
View article: ATOMIUM: ALMA tracing the origins of molecules in dust forming oxygen rich M-type stars
ATOMIUM: ALMA tracing the origins of molecules in dust forming oxygen rich M-type stars Open
This overview paper presents ATOMIUM , a Large Programme in Cycle 6 with the Atacama Large Millimeter/submillimeter Array (ALMA). The goal of ATOMIUM is to understand the dynamics and the gas phase and dust formation chemistry in the winds…
View article: Multiple components in the molecular outflow of the red supergiant NML Cyg
Multiple components in the molecular outflow of the red supergiant NML Cyg Open
Despite their large impact on stellar and galactic evolution, the properties of outflows from red supergiants are not well characterized. We used the Onsala 20m telescope to perform a spectral survey at 3 and 4 mm (68–116 GHz) of the red s…
View article: ATOMIUM: halide molecules around the S-type AGB star W Aquilae
ATOMIUM: halide molecules around the S-type AGB star W Aquilae Open
Context. S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate but have not been st…
View article: ATOMIUM: Halide molecules around the S-type AGB star W Aquilae
ATOMIUM: Halide molecules around the S-type AGB star W Aquilae Open
S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate, but have not been studied in…
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array II. CO envelope sizes and asymmetries: The S-type stars
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array II. CO envelope sizes and asymmetries: The S-type stars Open
We aim to constrain the sizes of the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively. We map the emission from the CO J=2-1 and 3-2 lines observed wit…
View article: Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS): following the water trail from the interstellar medium to oceans
Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS): following the water trail from the interstellar medium to oceans Open
Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS) is a space-based, MIDEX-class mission concept that employs a 17-meter diameter inflatable aperture with cryogenic heterodyne receivers, enabling high sensitivity and…