Wednesday colloquia

The API colloquia are weekly meetings where people give a 45 minute overview of their work. Afterwards there is time for discussion. At the end of each month the colloquia are jointly held with GRAPPA.

The contact person for the regular API colloquia is Selma de Mink.
The contact person for the joint GRAPPA/API colloquia is Jacco Vink.

Past colloquia

Master colloquium: Exploring the most massive stars beyond the Local Group

Olga Hartoog

As part of the X-Shooter science verification, we obtained the first intermediate-resolution spectrum of a massive star candidate in NGC~55, an LMC like galaxy at a distance of ~2.0 Mpc.

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Friday 8 October 2010, 15:30. Location: C1.112

Draft-strategy for NOVA participation E-ELT

Wilfried Boland — NOVA

As agreed on at last Board meeting I will visit each of the university
astronomical institutes to give a lunch talk on the draft-strategy for NOVA
participation in E-ELT instrumentation.

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Friday 8 October 2010, 14:00. Location: C0.110

Master colloquium: Evaluation of mass loss in the simulation of stellar clusters using a new multiphysics software environment

Guillermo Kardolus

In this research project stellar evolution and stellar dynamics are combined in the simulation of stellar clusters and binary systems. The numerical approximations are done using a fairly new software framework written in Python. This framework is called AMUSE, an abbreviation of Astrophysical MUltipurpose Software Environment.

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Thursday 30 September 2010, 10:00. Location: A1.06

A Closer Look At Type Ia Supernova Progenitors

Carles Badeness — Weizmann Institute, Tel-Aviv University

Despite decades of intensive work, the identity of the progenitor systems of Type Ia Supernovae (Ia SNe) still remains obscure. Most past efforts in this field have concentrated on the study of extragalactic SNe, which are too distant to examine in detail. I will describe a series of projects designed to shift the emphasis from distant objects to nearby ones: Type Ia Supernova Remnants and binary White Dwarfs in our own galactic backyard.

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Wednesday 29 September 2010, 16:00. Location: C1.112

Direct and coronographic Imaging of Extrasolar Planets

Matthew Kenworthy — Sterrewacht Leiden

The direct imaging of extrasolar planets allows us to investigate
systems with longer orbital periods, test competing planet formation
mechanisms, and to begin investigating their chemical structure and

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Friday 24 September 2010, 15:00. Location: C1.112

The multiwavelength view of ionized gas in AGN

Elisa Costantini — SRON

I'll review the importance of multiwavelength campaigns in studying the absorbing and emitting ionized gas, often observed outflowing at 100-1000 km/s from regions close to the black hole in active galaxies.

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Friday 17 September 2010, 15:00. Location: C1.112

Master colloquium: "Assessing the Impact of UV/X-ray Emission from Accreting Black Holes on the ISM"

Daniela Huppenkothen

Physical models of jets and accretion disks seen in X-ray binaries crucially depend on good multi-wavelength data from radio wavelengths to gamma rays. However, observations in the UV are very difficult to obtain, as most known black-hole binaries lie in the galactic plane and are thus heavily obscured by dust and gas which scatter, absorb and reprocess the emission.

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Friday 27 August 2010, 15:00. Location: C1.112

Master colloquium: SAX J1808.4-3658: An Extremely Cold Accreting Neutron Star

Frank Tramper — Universiteit van Amsterdam

Neutron stars provide the only way to study the behavior of matter at extreme densities. Crucial in understanding matter under these conditions are the heating and cooling processes that take place in accreting neutron stars, because the resulting radiation provides the only probe of the neutron star interior.

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Tuesday 3 August 2010, 14:00. Location: C1.110

Master colloquium: Super-orbital variability in low-mass X-ray binaries: a systematic soft and hard X-ray study

Anita Tol — UvA

X-rays, observed in low-mass X-ray binaries, originate from the accretion disc. I used data from the Rossi X-ray Timing Explorer All- Sky-Monitor and the Swift Burst-Alert Telescope to search for periodicities in the emitted X-rays.

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Wednesday 21 July 2010, 14:00. Location: C0.110

Master colloquium: The bursting behaviour of AX J1745.7-2901

Sjors Broersen — UvA

In this talk, the X-ray bursting behaviour of the faint, transient, X-ray binary AX J1745.6-2901 is reported. This dipping and eclipsing source was first observed in 1996 by Maeda and collaborators and has shown several periods of activity since then. We have screened all XMM Newton observations in which this source was in the field of view.

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Tuesday 13 July 2010, 14:00. Location: C4.124