Meni Zapri

Video arhiv astrodebat 2023/24

Thibault Merle: Spectroscopic binaries and higher-order systems in large surveys

torek, 7. november 2023

Thibault Merle
(Université Libre de Bruxelles, Belgija)

Multiplicity among field and cluster stars is ubiquitous. The properties of binary stars are therefore fundamental to understand how stars were formed and how they evolve. Interaction processes between components may lead to complex outcomes like chemically peculiar stars, stripped stars, transients and merger events. Binaries are easily identified through radial velocity variations measured in spectroscopy. Large spectroscopic surveys, like the Gaia-ESO survey (GES), are providing high accuracy radial velocities and chemical abundances for hundreds of thousands of stars. Among them, spectroscopic multiple stellar systems (spectroscopic binaries with one ore more visible components: SBn, with n≥1) deserve special investigation since the determined radial velocities and chemical abundances could be potentially affected by multiplicity. In this talk, I will summarize the findings obtained in the GES in terms of stellar multiplicity and the statistical properties of binary stars and present perspective in the context of other surveys (GALAH, 4MOST, MSE).

Video is available on this link!

Blaž Bortolato: Learning the Composition of Ultra High Energy Cosmic Rays

torek, 24. oktober 2023

Blaž Bortolato
(Institute Jožef Stefan, Ljubljana)

Earth is continuously exposed to a flux of cosmic particles, some of which carry very large energies, of the order of $10^{18}$ eV – $10^{20}$ eV. The origin and composition of these ultra-high energy cosmic rays (UHECRs) are still open problems.

In this talk, I will present a novel method for inferring the mass composition of UHECRs from the electromagnetic profile of their air showers. Furthermore, I will explore opportunities for enhancing the statistical significance of this dataset by exploiting its correlation with other shower observables.

Video is published on this link!

ASA AZ800 – nov teleskop na Astronomskem observatoriju na Golovcu

sreda, 11. oktober 2023

Dominik Patrick Kagerer
commisioning engineer
ASA Astrosysteme GmbH, Avstrija

Nov teleskop AZ800 s premerom glavnega zrcala 80 cm, ki smo ga prejeli ta teden, nam bo predstavil inženir podjetja ASA, ki je tudi vodil njegovo postavitev ter kalibracijo. Debata bo precej tehnične narave vendar nedvomno zanimiva, saj bomo bolj podrobno spoznali zmogljivosti in možnosti uporabe novega teleskopa, ki je tako postal naslednik teleskopa Vega v veliki kupoli observatorija.

Video is published on this link!