M. Maercker
YOU?
Author Swipe
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: 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: Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX Open
Aims. Our goal is to study the long-term mass-loss rate characteristics of asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar medium interaction. Methods. Far-ultraviolet (FUV) images from the GALEX survey are used…
View article: Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX Open
Aims. Our goal is to study the long-term mass-loss rate characteristics of asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar medium interaction. Methods. Far-ultraviolet (FUV) images from the Galex survey are used…
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: 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: DEATHSTAR: nearby AGB stars with the Atacama Compact Array
DEATHSTAR: nearby AGB stars with the Atacama Compact Array Open
Aims. We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, 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. Me…
View article: Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584
Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584 Open
Context. We report the detection of two lines at millimetre wavelengths towards the immediate surroundings of the post-giant and most likely post-common-envelope star HD 101584 using high-angular-resolution ALMA observations. The circumste…
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates Open
This is the first publication of the DEATHSTAR project. The goal of the project is to reduce the uncertainties of observational estimates of mass-loss rates from Asymptotic Giant Branch (AGB) stars. Line emission from 12CO J=2-1 and 3-2 we…
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array Open
Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic Giant Branch (AGB). Ai…
View article: An Infrared Study of the Circumstellar Material Associated with the Carbon Star R Sculptoris
An Infrared Study of the Circumstellar Material Associated with the Carbon Star R Sculptoris Open
The asymptotic giant branch (AGB) star R Sculptoris (R Scl) is one of the most extensively studied stars on the AGB. R Scl is a carbon star with a massive circumstellar shell ($M_{shell}\sim 7.3\times10^{-3}~M_{\odot}$) which is thought to…
View article: Inner dusty envelope of the AGB stars W Hydrae, SW Virginis, and R Crateris using SPHERE/ZIMPOL
Inner dusty envelope of the AGB stars W Hydrae, SW Virginis, and R Crateris using SPHERE/ZIMPOL Open
Context. The asymptotic giant branch (AGB) marks the final evolutionary stage of stars with initial masses between ~0.8 and 8 M ⊙ . During this phase, stars undergo copious mass loss, which contributes significantly to the enrichment of th…
View article: The extended molecular envelope of the asymptotic giant branch star <i>π</i><sup>1</sup> Gruis as seen by ALMA
The extended molecular envelope of the asymptotic giant branch star <i>π</i><sup>1</sup> Gruis as seen by ALMA Open
Context. This study is a follow up to the previous analysis of lower-angular resolution data in which the kinematics and structure of the circumstellar envelope (CSE) around the S-type asymptotic giant branch (AGB) star π 1 Gruis were inve…
View article: The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA II. The spiral-outflow observed at high-angular resolution
The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA II. The spiral-outflow observed at high-angular resolution Open
The AGB star $π^{1}$ Gruis has a known companion (at a separation of ~400 AU) which cannot explain the strong deviations from the spherical symmetry of the CSE. Recently, hydrodynamic simulations of mass transfer in closer binary systems h…
View article: Astro2020 Science White Paper: The fundamentals of outflows from evolved stars
Astro2020 Science White Paper: The fundamentals of outflows from evolved stars Open
Models of the chemical evolution of the interstellar medium, galaxies, and the Universe rely on our understanding of the amounts and chemical composition of the material returned by stars and supernovae. Stellar yields are obtained from st…
View article: High-resolution observations of gas and dust around Mira using ALMA and SPHERE/ZIMPOL
High-resolution observations of gas and dust around Mira using ALMA and SPHERE/ZIMPOL Open
Context. The outflows of oxygen-rich asymptotic giant branch (AGB) stars are thought to be driven by radiation pressure due to the scattering of photons on relatively large grains, with sizes of tenths of microns. The details of the format…
View article: ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell Open
Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like …
View article: ALMA observations of the “fresh” carbon-rich AGB star TX Piscium
ALMA observations of the “fresh” carbon-rich AGB star TX Piscium Open
Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like …
View article: Rotation of the asymptotic giant branch star R Doradus
Rotation of the asymptotic giant branch star R Doradus Open
High-resolution observations of the extended atmospheres of asymptotic giant branch (AGB) stars can now directly be compared to the theories that describe stellar mass loss. Using Atacama Large Millimeter/submillimeter Array (ALMA) high an…
View article: Modelling the carbon AGB star R Sculptoris
Modelling the carbon AGB star R Sculptoris Open
Context. On the asymptotic giant branch (AGB), Sun-like stars lose a large portion of their mass in an intensive wind and enrich the surrounding interstellar medium with nuclear processed stellar material in the form of molecular gas and d…
View article: An independent distance estimate to the AGB star R Sculptoris
An independent distance estimate to the AGB star R Sculptoris Open
Context. Distance measurements to astronomical objects are essential for understanding their intrinsic properties. For asymptotic giant branch (AGB) stars it is particularly difficult to derive accurate distance estimates. Period-luminosit…
View article: The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA I. Large-scale kinematic structure and CO excitation properties
The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA I. Large-scale kinematic structure and CO excitation properties Open
The S-type asymptotic giant branch (AGB) star $π^{1}$ Gruis has a known companion at a separation of $\approx$400 AU. The envelope structure, including an equatorial torus and a fast bipolar outflow, is rarely seen in the AGB phase and is …
View article: The circumstellar envelope around the S-type AGB star W Aql
The circumstellar envelope around the S-type AGB star W Aql Open
\n Context. Recent observations at subarcsecond resolution, now possible also at submillimeter wavelengths, have shown intricate circumstellar structures around asymptotic giant branch (AGB) stars, mostly attributed to binary interaction. …