Ruprecht-Karls-Universität Heidelberg
Vorträge, Seminare, Ereignisse

Vorträge, Seminare, Ereignisse

A list of all Physics & Astronomy talks and seminars taking place in Heidelberg can be found at HePhySTO.


Upcoming events


2019-08-30
15:00
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Double stars are trouble stars: Close pairs in Gaia DR2, DR3, DR4
Uli Bastian (ZAH/ARI)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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Abstract
On the one hand, double stars are a nuisance for data reductions. On the other hand, they are scientifically interesting and important. After all, binaries probably constitute the majority of the overall stellar population. Thus they are crucial e.g. for our understanding of the formation of stars and planets in general. The Gaia mission sees, discovers, measures and parameterizes double stars - both optical pairs and physical binaries - in a surprising multitude of ways. Each of these ways poses an operational challenge as well as a scientific chance. Once fully exploited they will give a strongly revised picture of stellar binarity statistics. And they will remove all the disturbances caused by duplicity in the astrometric and photometric data of Gaia DR2. Gaia DR1 achieved an effective angular resolution (i.e.pair separations) of 2 arcsec, DR2 of 0.4 arcsec. But the actual optical resolution of the Gaia instrument is about 0.15 arcsec, and there are ways to detect and measure pairs down to the milli-arcsec level. All this can be done for hundreds of millions of stars, but it means a few more years of hard work by the Gaia data reduction consortium.

2019-09-06
15:00
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Modeling embedded star formation
Michael Kueffmeier (ITA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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Abstract
Stars are embedded in di?erent environments of Giant Molecular Clouds during their formation phase. Despite this fact, it is common practice to assume an isolated spherical core as the initial condition for models of individual star formation. To avoid the uncertainties of initial and boundary conditions, we use an alternative approach of zoom-in simulations to account for the environment in which protostars form. Our magnetohydrodynamical simulations show that the diversity in protostellar environments is reflected in the accretion process of protostars, as well as in the disk formation process. Regarding protostellar multiples our analysis suggests that companions initially form with wider separations of ~1000 au and afterwards migrate to smaller separations of ~100 au from the primary star. Against the background of observations of bridge-like structures such as seen for e.g. IRAS 16293-2422, we find that similar structures emerge as transient phenomena during protostellar multiple formation. To account for infall events of single stars at later times, we study how encounter events with gas condensations affects the properties of the star and the properties of its disk.

2019-09-13
15:00
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Sarah Leslie (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2019-09-27
15:00
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Paola Pinilla (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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TBD

2019-10-18
15:00
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Accretion and Feedback in High-Mass Star Formation
Rolf Kuiper (Uni Tuebingen/MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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Abstract
In the course of their accretion phase, massive (proto)stars impact their natal environment in a variety of feedback effects such as thermal heating, MHD-driven protostellar jets and outflows, radiation forces, and photoionization / HII regions. Here, I present our most recent simulation results in terms of the relative strength of the feedback components and the size of the reservoir from which the forming stars gain their masses. For the first time, these simulations include all of the feedback effects mentioned above which allows us to shed light on the physical reason for the upper mass limit of present-day stars. Furthermore, we predict the fragmentation of massive circumstellar accretion disks as a viable road to the formation of spectroscopic massive binaries and the recently observed strong accretion bursts in high-mass star forming regions.

To advertise our latest code development, I will also overview the most recent results obtained in a variety of other astrophysical research fields from the formation of embedded Super-Earth planets' first atmospheres (Cimerman et al. 2017, MNRAS) to the formation of the progenitors of the first supermassive black holes in the early universe (Hirano et al. 2017, Science).

2019-10-22
16:15
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James Stone (web.astro.princeton.edu/people/james-stone)
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-10-25
15:00
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TBD
Ravit Helled (Zurich)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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TBD

2019-10-29
16:15
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Anna Frebel
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-11-05
16:15
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TBD
Joao Alves (http://www.iau.org/administration/membership/individual/9790/)
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-11-08
15:00
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New Light on Standard Candles: Testing Hubble Tension using High-precision Observations of Cepheid Variable Stars
Richard Anderson (ESO Garching)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-11-12
16:15
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TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-11-15
15:00
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Christine Wilson (McMasters)
Königstuhl Kolloquium ( Home pageHephysto link )
MPIA lecture hall,
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2019-11-19
16:15
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TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-11-22
15:00
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Back-up (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-11-26
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-11-29
15:00
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TBA
Patzer Colloquium (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-12-03
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-12-06
15:00
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TBD
Anaelle Maury (CEA/Saclay)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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TBD

2019-12-10
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2019-12-17
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-01-07
16:15
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TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-01-14
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-01-21
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-01-28
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-02-04
16:15
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TBD
TBD
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, großer Hörsaal

2020-06-19
15:00
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TBA
Sera Markoff (UVA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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TBA

KoCo Signature Speaker

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