[institut] [phys4phys] Naučno-stručni skup AOB -sutra- 7.2.2025. u 11h

[Natasa Bon]

Drage koleginice i kolege,

Pozivam vas na naučno-stručni skup koji će se održati u biblioteci AOB 
sutra u 11h.
Izvinjavam se na kasnom pozivu, danas smo se dogovorili oko termina.

Predavac je Tuğba Erol, master studentkinja Mihela Bileka, koja će 
ukratko izložiti temu svog master rada. Predavanje sa pitanjima je 
predviđeno da traje ukupno oko pola sata.

Ko ne bude bio u prilici da lično prisustvije predavanju, a ima želju da 
čuje, predavanje može pratiti preko zoom-a:

https://zoom.us/j/91915733862?pwd=XaFNpEyCTnCzYfSXcT2LJVYfal46lB.1

Meeting ID 919 1573 3862

Tuğba Erol, Erciyes University, Astronomy and Space Department, Türkiye

Naslov: Projection Effects in Determination of the Merger Time in Shell 
Galaxies with Illustris TNG

Apstrakt: Red giant and supergiant stars have many processes going on in 
them, from shell burning and thermal pulses to stellar pulsation an dust 
creation that can be difficult to interpret and model correctly. Here I 
present two cases where we used the MESA and GYRE software packages to 
model the behavior and evolutionary states of such stars. The first, T 
UMi used to be a Mira star whose pulsation period started to shorten 
drastically in the last few decades. We reproduced this behavior in the 
models and matched the observed characteristics, confirming that the 
star started a thermal pulse (He-shell flash) a few decades ago. We also 
predict that it might reach minimum radius and period within our 
lifetimes. The other star we studied is the red supergiant Betelgeuse, 
which recently went through an unusually faint phase. Not only did we 
identify a new pulsation mode in the star, we were also able to revise 
the physical size of the star through the models. Since Betelgeuse is 
close enough and large enough, its angular diameter can be measured: 
with that in hand we were able to calculate a new distance to the star 
based on seismic inferences alone, independent of previous measurements.


Srdačan pozdrav,

Nataša Bon




-- 
dr Natasa Gavrilovic Bon
Associate Research Professor
web site: http://nbon.aob.rs/
Astronomical Observatory Belgrade
Volgina 7
11160 Belgrade, Serbia
Tel:+381 11 3089 068
Fax:2419 553
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