SEMINAR ANNOUNCEMENT - OAT and DAUT SEMINAR - Wednesday February 28th, at 12:00 noon (Villa Bazzoni)

[Gabriella Schiulaz]

I announce you next OAT-DAUT seminar:

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               OATS-DAUT SEMINAR 
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Speaker: Giuseppe Bono (INAF-Osservatorio Astronomico di Roma) 

Title: Omega Centauri the possible link between globular clusters and dwarf galaxies 

Date: Wednesday, February 28th, 2007 
Time: 12:00 noon 
Venue: Villa Bazzoni 

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Abstract: Omega Centauri is one of the most interesting and puzzling Galactic stellar system. According to several empirical evidence (kinematics, total mass, spread in chemical composition) this system has been considered the relic of a dwarf spheroidal galaxy. However, the mass-to-light ratio and the velocity dispersion are quite typical of Galactic globular clusters. We present new star counts of evolved stellar tracers in Omega Centauri based on deep (ACS at HST) and wide (WFI at 2.2m ESO/MPI) multiband photometric investigations. In particular, we compare observed star counts with evolutionary lifetimes predicted by canonical and He-enriched stellar structures. Finally, we briefly mention a few extragalactic implications of He-enriched stellar populations.

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Future Seminars (March to June)

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OATS-DAUT SEMINAR 
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Speaker: Yasunori Fujii (Advanced Research Institute for Science and Engineering, Waseda Univ., Japan) 
Title: Scalar-tensor theory, the accelerating universe and the time-dependent fine-structure constant, part I 

Date: Monday, March 5th, 2007 
Time: 16:00 
Venue: Villa Bazzoni 

Abstract: The gravitational scalar field in the scalar-tensor theory is shown to provide a natural way to understand unique features of the accelerating universe. Further developing theoretical ideas allows us also to derive the time-dependent fine-structure constant, which is expected to constrain the parameters even more strongly than the way of acceleration. In part I (Monday 5, March in Osservatorio Astronomico di Trieste), emphases are placed mainly on the results to be compared with observations, while in part II (Monday 12, March in SISSA), more detailed analyses are applied to the theoretical foundations, including a general view on today's version of the cosmological constant problem, also comparison with the more phenomenological quintessence approach. The two parts, in either of which no prior experience on the scalar-tensor theory is required, can be attended as a sequence with certain subjects discussed somewhat repeatedly, though hopefully beyond mere redundancy. 

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OATS-DAUT SEMINAR 
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Speaker: Enzo Branchini (University of Roma Tre) 
Title: Looking for missing barions with x-ray glasses 

Date: Wednesday, March 7th, 2007 
Time: 12:00 
Venue: Villa Bazzoni 


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JOINT DAUT-ICTP-OATS-SISSA COLLOQUIUM 
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Speaker: Michele Maggiore (Geneva University) 
Title: Gravitational Waves: Theory and Observations 

Date: Thursday, March 15th, 2007 
Time: 16:00 
Venue: ICTP Main Building, Seminar Room, First Floor 



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OATS-DAUT SEMINAR 
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Speaker: Alessandra Rotundi (Università di Napoli "Parthenope")
Title: Stardust: the first laboratory analyses of cometary dust 

Date: Wednesday, March 21th, 2007 
Time: 12:00 
Venue: Villa Bazzoni 



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OATS-DAUT SEMINAR 
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Speaker: Patricia Sánchez-Blázquez (Univ. of Central Lancashire, UK) 
Title: The star formation history of early-type galaxies 

Date: Wednesday, March 28th, 2007 
Time: 12:00 
Venue: Villa Bazzoni 


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OATS-DAUT SEMINAR 
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Speaker: Francesco Marzari (Università di Padova) 
Title: Dynamics of Extrasolar Planets 

Date: Wednesday, April 4th, 2007 
Time: 12:00 
Venue: Villa Bazzoni 



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OATS-DAUT SEMINAR 
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Speaker: Pierluigi Selvelli (INAF-Osservatorio Astronomico di Trieste) 
Title: The OIII and NIII Bowen fluorescence lines in the symbiotic nova RR Tel 

Date: Wednesday, April 11st, 2007 
Time: 12:00 noon 
Venue: Villa Bazzoni 


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JOINT DAUT-ICTP-OATS-SISSA COLLOQUIUM 
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Speaker: Piero Madau (Univ. of California Observatories) 
Title: Cold Dark Matter Substructure in Galaxy Halos 

Date: Thursday, April 19th, 2007 
Time: 16:00 
Venue: Villa Bazzoni 


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OATS-DAUT SEMINAR 
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Speaker: Christian Theis (Institut fur Astronomie, Universitat Wien) 
Title: Modeling Interacting Galaxies 

Date: Wednesday, May 2nd, 2007 
Time: 12:00 
Venue: Villa Bazzoni 

Abstract: Interacting galaxies are among the most fascinating objects in the universe. Their morphology is frequently characterized by clear indications for an interaction, e.g. by large-scale features denoted as "arms", "bridges" or "rings". In principle, this wealth of information could be sufficient to restrict or fix the dynamical history of interacting galaxies and/or to allow for conclusions about their internal structure, e.g. their dark matter distribution. Unfortunately, an interaction between galaxies depends on many parameters which usually prohibits classical modelling strategies, e.g. those based on complete grids in parameter space. Additionally, state-of-the-art models of galactic evolution should not only include stellar dynamics, but also (multi-phase) gas dynamics, star formation and feedback processes. Such models are more complex from a conceptional point of view and they are computationally expensive.
In my talk I will discuss the problems related to theoretical modelling of interacting galaxies. I will present a multi-method modelling strategy: as a first step a new modelling technique for the analysis of observed interacting galaxies is applied. The method is based on a combination of an evolutionary search strategy (a genetic algorithm) with a fast restricted N-body simulation method. I will demonstrate the applicability of this approach for providing both, a uniqueness test of preferred interaction scenarios and an automatic fitting procedure for sufficiently detailed observations. As a second step the models will be refined by self-consistent models, which are based either on pure stellardynamical calculations or on full galactic evolutionary models including gas dynamics, star formation and feedback mechanisms.




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OATS-DAUT SEMINAR 
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Speaker: Ennio Poretti (INAF / Oss. Astron. di Brera) 
Title: Corot: Asteroseismology and Extrasolar Planets from Space 

Date: Tuesday, May 8th, 2007 
Time: 12:00 
Venue: Villa Bazzoni 


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JOINT DAUT-ICTP-OATS-SISSA COLLOQUIUM 
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Speaker: Max Pettini (Institute of Astronomy, Cambridge, UK) 
Title: The First Stars: Clues from Damped Lyman alpha Systems and Lyman Break Galaxies 

Date: Thursday, May 17th, 2007 
Time: 16:00 
Venue: Villa Bazzoni 



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JOINT DAUT-ICTP-OATS-SISSA COLLOQUIUM 
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Speaker: Albert Stebbins (Fermilab, Chicago) 
Title: Cosmological Large-Scale Structure 

Date: Thursday, June 21th, 2007 
Time: 16:00 
Venue: SISSA, Room D 


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For additional information on scheduled OAT seminars see:
http://adlibitum.oats.inaf.it/seminari/

Gabriella Schiulaz
segreteria OAT
Phone: 040-3199241
schiulaz at oats.inaf.it
segreteria at oats.inaf.it