Ruprecht-Karls-Universität Heidelberg

Vorträge, Seminare, Ereignisse

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


Upcoming events


2021-09-24
15:00
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Saskia Hekker (HITS)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2021-09-24
15:00
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Saskia Hekker (HITS)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2021-09-24
15:00
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Asteroseismology: what makes stars tick?
Saskia Hekker (HITS)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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What physical processes (i.e. energy transport, rotation, chemical mixing etc) inside a star cause the star to behave in a certain way? The surface properties of a star typically do not reveal enough information to infer these processes. Therefore, we need a window to look inside the stars. This window is provided by asteroseismology - the study of the internal structure of stars through their global oscillation modes. In this talk I will provide a brief introduction to this field and present some recent results as well as challenges we are facing.

2021-10-01
15:00
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Sü Suri (Uni Vienna)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-08
15:00
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Jacques Kluska (KU Leuven)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-08
15:00
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Jacques Kluska (KU Leuven)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-08
15:00
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Jacques Kluska (KU Leuven)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-15
15:00
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Leindert Boogaard (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-21
11:15
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Revealing the Milky Ways Dissolved Star Cluster Population with Dynamics, Chemistry, and HighDimension Analysis
Jeremy Webb (University of Toronto)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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Abstract
The Milky Way consists of a large number of star clusters, with over 150 being labelled as old,metal poor globular clusters and thousands being labelled as young, metal-rich open clusters. However thesenumbers are small compared to the total number of clusters that have ever existed in the Milky Way, as mosthave fully dissolved between their time of formation and the present day. Most of the constraints that havebeen placed on the Milky Ways dissolved star cluster population have been made by extrapolating how thestar cluster initial mass function, initial size function, and formation rate have evolved over time. In thistalk, I will introduce some more direct ways of studying dissolved star clusters that make use of internal starcluster dynamics, orbital dynamics, chemical tagging, and high dimension analysis. More specifically I willintroduce a new method for constraining progenitor cluster properties through deep observations of stellarstreams, demonstrate how stellar siblings can be identified through the combined use of orbital dynamics,chemical tagging, and discuss a new particle spray code that can be used with high dimensional analysis tofind extra-tidal stars.

2021-10-22
15:00
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Sümeyye Suri (Uni Vienna)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-10-28
11:15
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Changing the paradigm of globular cluster formation
Ivan Cabrera-Ziri (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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Globular cluster formation is a major unsolved problem in astrophysics. The latest constraints tothe problem have come from puzzling abundance variations of light-elements among their stars. The pursuitto explain this longstanding problem using these chemical signatures has reinvigorated the study of globularclusters, and at the same time has challenged our understanding of nucleosynthesis and stellar evolution. Forthis talk, I will start with an overview of the challenges facing current models of globular cluster formation.Then I will present the steps being taken to build the next generation of globular cluster formation modelsand discuss how we can use the properties of globular cluster to trace the build-up of galaxies.

2021-10-29
15:00
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Launching of astrophysical jets
Christian Fendt (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-04
11:15
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Lachlan Lancaster (Princeton University)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2021-11-05
15:00
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Bertram Bitsch (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-11
11:15
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Eva Grebel (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2021-11-12
15:00
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Kamber Schwarz (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-18
11:15
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The ROME/REA microlensing survey: Three years of Galactic bulge observations
Yiannis Tsapras (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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Abstract
The ROME/REA project (2017-2020) aimed to discover extrasolar planets by regularly monitoringmillions of stars in the Galactic bulge and looking for ongoing microlensing events. From April to Septembereach year, when the Galactic bulge was visible from the Southern hemisphere, the robotic telescopes of theLas Cumbres Observatory were used to observe a total area of about 4 square degrees in the sky in threedifferent bands. An automated process assessed ongoing microlensing events in real time for their sensitivityto planetary signals and additional observations were requested to characterize signals of particular scientificinterest. Our final catalog of stars contains more than 4 million individual sources. As we prepare for our firstpublic data release, I will present some of the results, talk about the data products we will soon be releasingand describe our current work and plans for the future.

2021-11-19
15:00
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Christian Eistrup (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-25
11:15
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Observational properties of O star- black hole binaries
Varsha Ramachandran (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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High Mass X-ray binaries (HMXB) with black hole companions represent a key intermediate stepin the binary black hole formation channel. Detailed knowledge of the stellar and wind parameters of thedonor is essential to understand the complex behavior of such systems. Our current understanding of wind ofmassive stars in black hole binaries is mostly based on Cygnus X-1 in our Galaxy and was not analyzed bymeans of sophisticated stellar atmosphere models. In this study, we carried out a detailed analysis of windsof doner star in M33 X-7 as well as a re-analysis of Cygnus X-1. M33 X-7 is the only known eclipsing blackhole binary with a very massive O supergiant donor and one of the most massive black holes known in anHMXB. In this talk, I will present a detailed spectroscopic analysis (Xray+UV+optical) of the massive donorduring different orbital phases. This sheds light on the stellar and wind parameters of the metal-poor donorstar. The observed properties are compared with detailed binary-evolution tracks to constrain the possibleformation channel and evolutionary fate of the system.

2021-11-26
15:00
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Prize winners
Patzer colloquium
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-26
15:00
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Prize winners
Patzer colloquium
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-26
15:00
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Prize winners
Patzer colloquium
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-11-26
15:00
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Prize winners
Patzer colloquium
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-12-02
11:15
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Christoph Engler (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2021-12-03
15:00
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Sara Rezaei Kh. (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-12-09
11:15
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Kseniia Sysoliatina (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2021-12-10
15:00
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Heidelberg-Harvard participant (?)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2021-12-16
11:15
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The cloud-scale baryon cycle across the nearby galaxy population
Melanie Chevance (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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Abstract
The cycling of matter in galaxies between molecular clouds, stars and feedback is a major driverof galaxy evolution. However, it remains a major challenge to derive a theory of how galaxies turn their gasinto stars and how stellar feedback affects the subsequent star formation on the cloud scale, as a functionof the galactic environment. Star formation in galaxies is expected to be highly dependent on the galacticstructure and dynamics, because it results from a competition between mechanisms such as gravitationalcollapse, shear, spiral arm passages, cloud-cloud collisions, and feedback processes such as supernovae, stellarwinds, photoionization and radiation pressure. A statistically representative sample of galaxies is thereforeneeded to probe the wide range of conditions under which stars form. I will present the first systematiccharacterisation of the evolutionary timeline of the giant molecular cloud (GMC) lifecycle, star-formation andfeedback in the PHANGS sample of star-forming disc galaxies. I will show that GMC are short-lived (10-30Myr) and are dispersed after about one dynamical timescale by stellar feedback, between 1 and 5 Myr aftermassive stars emerge. Although the coupling efficiency of early feedback mechanisms such as photoionisationand stellar winds is limited to a few tens of percent, it is sufficient to disperse the parent molecular cloudprior to supernova explosions. This limits the integrated star formation efficiencies of GMCs to 2 to 10 percent. These findings reveal that star formation in galaxies is fast and inefficient, and is governed by cloud-scale, environmentally-dependent, dynamical processes. These measurements constitute a fundamental testfor numerical sub-grid recipes of star-formation and feedback in simulations of galaxy formation and evolution.

2021-12-17
15:00
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Ugne Dudzeviciute (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2022-01-13
11:15
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Rainer Spurzem (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2022-01-27
11:15
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The tale of the long uphill struggle of GBOT
Martin Altmann (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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The highly praised ESA Gaia satellite mission has already provided the astronomic communitywith high quality astrometric, photometric and other data for almost 2 billion stars, and will continue to do sofor the next years. As time goes by, the precision of the astrometry increases with the number of measurementsand the time-span during which these are obtained, growing. Thus the correction of systematic effects in thedata, such as aberration need to be corrected to a point, where the conventional means do not suffice anymore.To accomplish this, a programme was conceived, to track the satellite with highly precise (20 mas) groundbased astrometry to deliver the required data for the optimisation of Gaia’s accuracy, called Ground BasedOptical Tracking (GBOT). This programme has faced many challenges and uncertainties, as well as set backs,but finally GBOT has come to the point, where its data are being included in the processing of the Gaiaastrometry, since 2020.This presentation will give an overview of the history of GBOT, and the steps taken to ensure final success,after many years of challenges. I will also report on a project searching for asteroids on the existing GBOTdata, which has lead to observations of about 42,000 objects, of which about 18,000 were previously unknown.

2022-01-28
11:00
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Jan-Torge Schindler (Leiden Obs./MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2022-01-28
15:00
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Jan-Torge Schindler (Leiden Observatory)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2022-02-03
11:15
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Hossam Aly (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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2022-02-10
11:15
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Jaeyeon Kim (ARI)
ARI Institute Colloquium ( Hephysto link )
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG
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