Colloquium on 11 June 2015
Resolving stellar populations with MUSE


Title: Resolving stellar populations with MUSE
Speaker: Tim-Oliver Husser
Date: Thursday, 11 June 2015
Time: 11:00 - 12:00
Venue: SAAO Auditorium


In my talk I will present the first results from a large observing campaign focused on the stellar populations in globular clusters using the recently commissioned integral field spectrograph MUSE. We are going to target about 30 clusters in the Milky Way, of which some have already been observed during commisioning and in GTO time. Using the technique of crowded field spectroscopy that we developed, we can resolve several thousand stellar spectra in a single datacube of the highly crowded cluster centres – as an example, about 90 minutes of observations on NGC 6397 yielded ~24,000 spectra of >12,000 stars, with a large fraction well below the main-sequence turnoff. Dedicated analysis tools allow us to determine radial velocities and stellar parameters for most stars in this sample. This will help us to better understand kinematics in globular clusters as well as their chemical compositions. In addition,
multi-epoch observations will provide us for the first time with constraints on the distribution of binary periods inside the clusters.

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