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38 papers · 2 filters
Three-dimensional hydrodynamical CO5BOLD model atmospheres of red giant stars II. Spectral line formation in the atmosphere of a giant located near the RGB tip
A. Kucinskas, M. Steffen, H. -G. Ludwig +6
We investigate the role of convection in the formation of atomic and molecular lines in the atmosphere of a red giant star. For this purpose we study the formation properties of sp…
Two massive stars possibly ejected from NGC 3603 via a three-body encounter
V. V. Gvaramadze, A. Y. Kniazev, A. -N. Chene +1
We report the discovery of a bow-shock-producing star in the vicinity of the young massive star cluster NGC 3603 using archival data of the Spitzer Space Telescope. Follow-up optic…
Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars
A. -N. Chené, J. Borissova, C. Bonatto +20
Context: The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge,…
The Magnetic Topology of the Weak-Lined T Tauri Star V410 - A Simultaneous Temperature and Magnetic Field Inversion
T. A. Carroll, K. G. Strassmeier, J. B. Rice +1
We present a detailed temperature and magnetic investigation of the T Tauri star V410 Tau by means of a simultaneous Doppler- and Zeeman-Doppler Imaging. Moreover we introduce a ne…
Flip-flops of FK Comae Berenices
Thomas Hackman, Jaan Pelt, Maarit J. Mantere +6
FK Comae is a rapidly rotating magnetically active star, the light curve of which is modulated by cool spots on its surface. It was the first star where the "flip-flop" phenomenon…
Digitization of Spörer's sunspot drawings
Andrea Diercke, Rainer Arlt, Carsten Denker
Much of our knowledge about the solar dynamo is based on sunspot observations. It is thus desirable to extend the set of positional and morphological data of sunspots into the past…