From raffaella.schneider at uniroma1.it  Wed Apr  6 08:30:11 2022
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Wed, 6 Apr 2022 08:30:11 +0200
Subject: [astroseminar@Sapienza] Reminder for the next quid ultra colloquium
 by Georges Meynet, Wednesday April 6 at 16:30
Message-ID: <1EB9B13C-9129-43BA-927B-83DCBBF41F3E@uniroma1.it>

Dear Colleagues,

this is to gently remind you that the next online colloquium of the series: 

Quid Ultra? Frontiers and Controversies in Astrophysics 

will be today, wednesday, April 6 2022 at 16:30 by Georges Meynet (Geneva University).

Title and abstract are attached below. 

The seminar will be held remotely by the speaker through the following zoom link:

https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09 <https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09>
 
ID riunione: 811 2290 1013
Passcode: 686688
 
The program QUID ULTRA? Frontiers and Controversies in Astrophysics is a series of monthly prestigious colloquia that will be 
running from early February till October 2022. This initiative has been funded by Sapienza University with the co-sponsorship of 
INAF/Astronomical Observatory of Rome and of the joint PhD program in Astronomy, Astrophysics and Space Science of Sapienza, 
Tor Vergata University and INAF.

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)
????????????????
April 6 2022, 16:30

Speaker: Georges Meynet (Geneva University)

Title: Stars at the Extreme: First Stars, Spinstars and Supermassive stars

Abstract:
The presentation will focus on stars at some extreme either from the point of view of their mass (supermassive stars), rotation (spinstars) or initial composition 
(Pop III stars). The talk will begin by a general overview of the main challenges faced by the modeling of massive stars with a special focus on the 
transport processes in convective and radiative zones. Then the presentation will continue discussing recent results about the binary statistics of Pop III 
populations, the chemical and radiative feedback of Pop III stars, the evolution of very massive stars i.e. stars with masses between 150 and 300 solar 
masses at different metallicities addressing the question of the progenitor of Pair Instability supernovae and the limits of the mass domain for the 
black hole mass gap. Finally, new models for the formation of supermassive stars that are candidates as seeds for the formation of supermassive black holes 
at high redshift will be presented.
ly
Phone: +39 06 4991 4312
Skype: raffasch
Zoom: https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09



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From raffaella.schneider at uniroma1.it  Tue Apr 19 13:42:02 2022
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Tue, 19 Apr 2022 13:42:02 +0200
Subject: [astroseminar@Sapienza] Announcement of Amaldi Research Center
 seminar by K. Omukai, Wednesday April 20 2022, at 16:30 in Aula Conversi,
 Dip. di Fisica, Sapienza
Message-ID: <0053DCBF-D766-45E8-B7E3-C6C2A2A06FB1@uniroma1.it>

Dear Students and Colleagues,

We are pleased to announce the following Amaldi Research Center seminar by Kazuyuki Omukai (Tohoku University) on Wednesday, April 20 2022 at 16:30
in aula Conversi, Dipartimento di Fisica, Sapienza Universit? di Roma. Title and abstract are attached below. 

It will be possible to follow the seminar remotely via the zoom link:

Link zoom: https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09 <https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09> 

Looking forward to seeing you soon, 

Raffaella Schneider 


Wednesday April 20 2022 at 16:30 in Aula Conversi, Dipartimento di Fisica, Sapienza Universit? di Roma

Kazuyuki Omukai (Tohoku University)

Formation of Very Low Metallicity Stars

I overview the thermal and chemical properties of low metallicity gas and their consequence 
on the dynamics of star forming gas, paying particular attention to the fragmentation mass scale. 
I then report on our recent numerical simulation of star cluster formation at low metallicities and 
on how the transition of initial mass function proceeds with increasing metallicity.
I also mention supermassive star formation in very low metallicity environments.

Link zoom: https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09 <https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09>






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