Publications (13)
A detailed view of the gas shell around R Sculptoris with ALMA
M. Maercker, W. H. T. Vlemmings, M. Brunner +6
Thermal pulses are fundamental to the chemical evolution of AGB stars and their circumstellar envelopes. A further consequence of thermal pulses is the formation of detached shells…
Three- and four-body interactions in colloidal systems
J. Dobnikar, M. Brunner, Jörg Baumgartl +2
Three-body and four-body interactions have been directly measured in a colloidal system comprised of three (or four) charged colloidal particles. Two of the particles have been con…
Measuring the equation of state of a hard-disc fluid
M. Brunner, C. Bechinger, U. Herz +1
We use video microscopy to study a two-dimensional (2D) model fluid of charged colloidal particles suspended in water and compute the pressure from the measured particle configurat…
Extended view on the dust shells around two carbon stars
M. MeÄina, B. Aringer, W. Nowotny +4
Stars on the asymptotic giant branch (AGB) lose considerable amounts of matter through their dust-driven stellar winds. A number of such sources have been imaged by Herschel/PACS,…
ALMA observations of the variable 12CO/13CO ratio around the asymptotic giant branch star R Sculptoris
W. H. T. Vlemmings, M. Maercker, M. Lindqvist +7
[abridged] The 12CO/13CO ratio is often used as a measure of the 12C/13C ratio in the circumstellar environment, carrying important information about the stellar nucleosynthesis. E…
Three-body interactions in colloidal systems
J. Dobnikar, M. Brunner, H. H. von Grünberg +1
We present the first direct measurement of three-body interactions in a colloidal system comprised of three charged colloidal particles. Two of the particles have been confined by…
An independent distance estimate to the AGB star R Sculptoris
M. Maercker, M. Brunner, M. Mecina +1
For the carbon AGB star R Sculptoris, the uncertain distance significantly affects the interpretation of observations regarding the evolution of the stellar mass loss during and af…
Aperture synthesis imaging of the carbon AGB star R Sculptoris: Detection of a complex structure and a dominating spot on the stellar disk
M. Wittkowski, K. -H. Hofmann, S. Höfner +16
We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris. The visibility data indicate a broadly circular resolved stellar disk wi…
Momentum-space electronic structures and charge orders of high-temperature superconductors Ca2-xNaxCuO2Cl2 and Bi2Sr2CaCu2O8+delta
Jianqiao Meng, M. Brunner, K. -H. Kim +6
We study the electronic structure of Ca2-xNaxCuO2Cl2 and Bi2Sr2CaCu2O8+d samples in a wide range of doping, using angle-resolved photoemission spectroscopy, with emphasis on on the…
Properties of dust in the detached shells around U Ant, DR Ser, and V644 Sco
M. Maercker, T. Khouri Silva, E. De Beck +3
Understanding the properties of dust produced during the asymptotic giant branch phase of stellar evolution is important for understanding the evolution of stars and galaxies. Rece…
Direct measurement of three-body interactions
M. Brunner, J. Dobnikar, H. H. von Grünberg +1
Three-body interactions have been measured among three charged colloidal particles in deionized solvent. Two of the particles have been confined to an optical line-trap while the t…
The circumstellar envelope around the S-type AGB star W Aql Effects of an eccentric binary orbit
S. Ramstedt, S. Mohamed, W. H. T. Vlemmings +9
The CO(J=3-2) emission from the CSE of the binary S-type AGB star W Aql has been observed at subarcsecond resolution using ALMA. The aim of this paper is to investigate the wind pr…
Rings and filaments: The remarkable detached CO shell of U Antliae
F. Kerschbaum, M. Maercker, M. Brunner +11
Aims. Our goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possib…