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X-WR-CALNAME:Osservatorio Astrofisico di Catania
X-ORIGINAL-URL:https://www.oact.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astrofisico di Catania
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DTSTART;TZID=UTC:20241021T113000
DTEND;TZID=UTC:20241021T123000
DTSTAMP:20260404T234321
CREATED:20241014T110601Z
LAST-MODIFIED:20241014T110605Z
UID:17010-1729510200-1729513800@www.oact.inaf.it
SUMMARY:Stellar-wind-fed magnetospheres of magnetic massive stars
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, October 21\, 11:30 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Prof. Stanley Owocki (University of Delaware) \nABSTRACT:A subpopulation (~9%) of hot (OB) stars exhibit strong (B~100-10\,000 G)\, large-scale (often predominantly dipolar) magnetic fields that channel their stellar wind outflows into circumstellar magnetospheres. For young\, rapidly rotating B-stars that have not yet been spun down by wind-magnetic braking\, wind material can be trapped between the Kepler co-rotation radius (RK) and the Alfven radius (RA)\, forming then a “Centrifugal Magnetosphere” (CM)\, with density set at the critical level for “Centrifugal Breakout” (CBO) against the confining magnetic tension. This talk discusses how such CBO controls both the onset and strength of observed H-alpha emission\, while the energetics of the associated CBO-driven magnetic reconnection match well the observed scalings of a non-thermal\, circularly polarized radio emission from such stars . \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/stellar-wind-fed-magnetospheres-of-magnetic-massive-stars/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/10/seminario_Owocky.jpg
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DTSTART;TZID=UTC:20240422T110000
DTEND;TZID=UTC:20240422T110000
DTSTAMP:20260404T234321
CREATED:20240418T141120Z
LAST-MODIFIED:20240418T141602Z
UID:16101-1713783600-1713783600@www.oact.inaf.it
SUMMARY:Archeology of interstellar archipelagos: Reconstructing the lifecycle of star-forming clouds
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, April 22\, 11:00 a.m. \nORGANIZER: INAF OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dr. Juan Diego Soler (IAPS-INAF) \nABSTRACT: \nDetermining how star-forming molecular clouds (MCs) arise from and interact with the diffuse interstellar medium (ISM) is crucial for understanding the initial conditions of planet and star formation and the evolution of the Milky Way and other similar galaxies. I will present state-of-the-art observations of neutral atomic hydrogen (HI) and interstellar magnetic fields\, which\, combined with numerical simulations and novel statistical tools based on machine vision\, reveal three crucial aspects of the MC lifecycle. First\, the signature of magnetization in the structure of MCs in the solar neighborhood\, within 500 parsecs from the Sun. Two\, the imprint of supernova feedback in the HI structure across the Galactic plane. And finally\, the coupling between atomic and molecular gas in and around MCs. I will discuss the consequences of these findings for our understanding of the Galactic ecosystem and the prospects for radio-interferometric and submillimeter polarization observations from the forthcoming facilities. \n  \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/archeology-of-interstellar-archipelagos-reconstructing-the-lifecycle-of-star-forming-clouds/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/04/Soler_seminario.jpg
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