[Astronomy seminar] Astronomy departmental seminar Friday September 1st at 10:30am - Janez Kos (University of Ljubljana)

[Astronomy seminar announcements]

Dear all,


The next SU astronomy departmental seminar will take place on Friday 
September 1st at 10:30am in room FC61 (AlbaNova building, 6th floor) and 
on zoom (https://stockholmuniversity.zoom.us/s/61002076352).


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Speaker: Janez Kos (University of Ljubljana)

Title: Tidal tails of open clusters

https://www.albanova.se/event/janez-kos/ 
<https://www.albanova.se/event/janez-kos/>


Abstract:

Tidal tails of open clusters have first been observed only in the recent 
couple of years. Like the tails of globular clusters and satellite 
galaxies, they can be used as important probes of gravitational fields, 
galactic evolution, disk kinematics, and stellar evolution. Recent 
progress has been possible with the arrival of Gaia data releases, so we 
can find tails of structures 1000 times smaller than globular clusters 
in the environment 1000 times denser than the halo. I will present a 
probabilistic method that does not directly rely on finding 
overdensities. We use simulations of cluster disintegration to define 
likelihoods for Gaia stars to be cluster members, and simulations of the 
Galactic stellar population to define membership probabilities. In an 
analysis of 500 clusters, we reliably find stars in tidal tails 1000 pc 
away from cluster cores. I will also discuss the need for precise radial 
velocities (not used in our method), obtaining more complete mass 
functions, and observed oddities that hint at numerous kinematical 
processes that shape the tidal tails.

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We look forward to seeing many of you there. Thanks!


Adur and Adélaïde


Upcoming Events:

2023-09-08 Mattia Bulla (University of Ferrara)

2023-09-15 TBD

2023-09-22 Henk Spruit (MPIA)


You can subscribe to the seminars calendar in: 
https://ttt.astro.su.se/ical/astro-seminars.ics

(Please note that calendar can be subject to updates)


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Join Zoom Meeting:

https://stockholmuniversity.zoom.us/s/61002076352

Meeting ID: 610 0207 6352


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