Colloquia
SFB Seminar "The Milky Way System"ARI Institute Colloquium
Teeseminar: Working Group-Meeting on Experimental Stellar Dynamics
X-Astro Group Meeting on Extragalactic Astronomy
Heidelberg Joint Astronomical Colloquium
Physics Colloquium
MPIA Visitors' Seminar
Further Colloquia of the Faculty
24.05.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
A. Bik MPIA
Reconstructing the complex formation history of high-mass
Massive stars are typically observed to form in clustered environments, with morphologies ranging from very dense, centrally concentrated starburst clusters to loose associations. These associations and clusters are morphologically and dynamically different. It is not clear if these differences arise from different initial conditions in the star formation process or environmental effects, like triggered star formation. We have started a large observational campaign to derive the star formation history of several massive star formation complexes in order to reconstruct the star formation mechanisms. I will demonstrate that near-infrared spectroscopy and photometry using LBT and VLT, combined with a large suite of multi-wavelength observations allow us to obtain a detailed picture of the stellar clusters and their stellar populations. Different stellar populations are found in many embedded clusters, suggesting that the star formation history is much more complex than a single star formation event. Based on LBT multi-object spectroscopy of the massive stellar content of W3 Main I will present strong evidence for an age spread where the oldest massive star formed 2-3 Myrs ago while some other massive stars are still in their formation process.
31.05.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
R. Haschke ARI
The variable stars of the Magellanic Clouds: Tracers for structure and abundances
14.06.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
J. Downing ARI
21.06.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
H.-Y. Schive National Taiwan University
Parallel GPU simulations with adaptive mesh for simulations of galaxies
25.06.2012 11:15h
Special Colloquium
Seminar room of the ARI
N. Zacharias United States Naval Observatory
UCAC and URAT: All-sky deep Reference Star Catalogue before Gaia
The 4th and final release of the USNO CCD Astrograph Catalog (UCAC) is being released this summer. The all-sky catalog contains positions for about 113 million stars to 16th magnitude. Proper motions are derived from various early epoch catalogs including SPM and NPM data, however not including Schmidt survey data. The USNO Robotic Astrometric Telescope (URAT) begun to observe the northern sky on April 24, 2012. A single exposure covers 28 sq.deg. With 2-3 years of observing per hemisphere URAT will be able to derive positions and proper motions for stars in the 5 to 17.5 mag range. Parallaxes for nearby stars will be obtained independent of selection criteria. Positions for well exposed stars will be on the 10 mas level.
28.06.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
A. Just ARI
An evolutionary model of the extended solar neighbourhood
05.07.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
M. Hauser ARI
12.07.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
M. Demleitner ARI
tbc
19.07.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
U. Bastian ARI
“Planet hunters” – citizen science in action
26.07.2012 11:15h
ARI Institute Colloquium
Seminar room of the ARI
Th. Lisker ARI
What is a dwarf galaxy?
By summarizing current knowledge and trying to provoke discussion, I will address questions like these: Is there a common definition for when a galaxy is called a 'dwarf'? Does it have a physical motivation? How can there be dwarfs and non-dwarfs at the same mass? What properties do they have in terms of star formation rate, internal dynamics, structure, stellar populations? Can different types be transformed into each other? Are our Local Group dwarfs representative for the rest of the nearby universe?
Contact: S. Matyssek
