74 citations · 308 across the 9 of their papers we have counts for
9 papers
VLTI-GRAVITY measurements of cool evolved stars: I. Variable photosphere and extended atmosphere of the Mira star R Peg
M. Wittkowski, G. Rau, A. Chiavassa +7
Dynamic model atmospheres of Mira stars predict variabilities in the photospheric radius and in atmospheric molecular layers which are not yet strongly constrained by observations.…
Near-infrared spectro-interferometry of Mira variables and comparisons to 1D dynamic model atmospheres and 3D convection simulations
M. Wittkowski, A. Chiavassa, B. Freytag +4
We obtained a total of 20 near-infrared K-band spectro-interferometric snapshot observations of the Mira variables o Cet, R Leo, R Aqr, X Hya, W Vel, and R Cnc with a spectral reso…
Resolving asymmetries along the pulsation cycle of the Mira star X Hya
X. Haubois, M. Wittkowski, G. Perrin +6
The mass-loss process in Mira stars probably occurs in an asymmetric way where dust can form in inhomogeneous circumstellar molecular clumps. Following asymmetries along the pulsat…
Structure and shaping processes within the extended atmospheres of AGB stars
M. Wittkowski, D. A. Boboltz, I. Karovicova +4
We present recent studies using the near-infrared instrument AMBER of the VLT Interferometer (VLTI) to investigate the structure and shaping processes within the extended atmospher…
The extended atmospheres of Mira variables probed by VLTI, VLBA, and APEX
M. Wittkowski, D. A. Boboltz, C. de Breuck +9
We present an overview on our project to study the extended atmospheres and dust formation zones of Mira stars using coordinated observations with the Very Large Telescope Interfer…
VLTI/AMBER spectro-interferometric imaging of VX Sgr's inhomogenous outer atmosphere
A. Chiavassa, S. Lacour, F. Millour +8
Aims. We aim to explore the photosphere of the very cool late-type star VX Sgr and in particular the existence and characterization of molecular layers above the continuum forming…