Browsing by Author "Wittkowski, M"
Now showing 1 - 4 of 4
Results Per Page
Sort Options
- ItemOpen AccessAperture synthesis imaging of the carbon AGB star R Sculptoris: Detection of a complex structure and a dominating spot on the stellar disk(2017) Wittkowski, M; Hofmann, K-H; Höfner, S; Le Bouquin, J B; Nowotny, W; Paladini, C; Young, J; Berger, J-P; Brunner, M; de Gregorio-Monsalvo, I; Eriksson, K; Hron, J; Humphreys, E M L; Lindqvist, M; Maercker, M; Mohamed, S; Olofsson, H; Ramstedt, S; Weigelt, GAims. We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris (R Scl).
- ItemOpen AccessMulti-epoch VLTI-PIONIER imaging of the supergiant V766 Cen: Image of the close companion in front of the primary(2017) Wittkowski, M; Abellán, F J; Arroyo-Torres, B; Chiavassa, A; Guirado, J C; Marcaide, J M; Alberdi, A; de Wit, W J; Hofmann, K-H; Meilland, A; Millour, F; Mohamed, S; Sanchez-Bermudez, JContext. The star V766 Cen (=HR 5171A) was originally classified as a yellow hypergiant but lately found to more likely be a 27−36 M⊙ red supergiant (RSG). Recent observations indicated a close eclipsing companion in the contact or common-envelope phase.
- ItemOpen AccessNear-infrared spectro-interferometry of Mira variables and comparisons to 1D dynamic model atmospheres and 3D convection simulations(2016) Wittkowski, M; Chiavassa, A; Freytag, B; Scholz, M; Höfner, S; Karovicova, I; Whitelock, P AAims. We aim at comparing spectro-interferometric observations of Mira variable asymptotic giant branch (AGB) stars with the latest 1D dynamic model atmospheres based on self-excited pulsation models (CODEX models) and with 3D dynamic model atmospheres including pulsation and convection (CO5BOLD models) to better understand the processes that extend the molecular atmosphere to radii where dust can form.
- ItemOpen AccessRings and filaments: The remarkable detached CO shell of U Antliae(2017) Kerschbaum, F; Maercker, M; Brunner, M; Lindqvist, M; Olofsson, H; Mecina, M; De Beck, E; Groenewegen, M A T; Lagadec, E; Mohamed, S; Paladini, C; Ramstedt, S; Vlemmings, W H T; Wittkowski, MAims. 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 possible thermal pulse.