BEGIN:VCALENDAR VERSION:2.0 PRODID:-//AIP Calendar//www.aip.de// BEGIN:VEVENT SUMMARY:Colloquium: Silva Järvinen (AIP) DTSTART:20210506T123000Z DTEND:20210506T133000Z DTSTAMP:20260530T232324Z UID:www.aip.de-867 CATEGORIES:Scientific CATEGORIES:Generic Event CATEGORIES:Public CONTACT:Sydney Barnes DESCRIPTION:Elusive magnetic fields of Herbig stars\nMagnetic fields play a key role in the processes leading to the formation of stars and planets. Analytical models and MHD numerical simulations of the evolution of star- forming cores show that the magnetic field is critical for transporting an gular momentum during the protostellar phase and sets the conditions for s trongly anisotropic accretion. Pre-main-sequence phases\, in which central protostars feed from surrounding planet-forming accretion discs\, are esp ecially crucial for understanding how worlds like our Solar System are bor n. About 20 Herbig Ae/Be stars have been reported to have globally organiz ed magnetic fields. Our analysis of their magnetic fields based on observa tions obtained with HARPSpol at ESO’s 3.6m telescope supports the idea t hat the low detection rate of magnetic fields in these stars can be explai ned by the weakness of these fields: only a few stars have magnetic fields stronger than 200 G\, and half of the sample possesses magnetic fields of ∼100G\, whereas their lower mass T Tauri counterparts possess kG magnet ic fields. Studies of the magnetic field structure combined with the deter mination of the chemical composition of Herbig Ae/Be stars are extremely i mportant because they enable us to improve our insight into how the magnet ic fields in these stars are generated and how they interact with their en vironment\, including their impact on the planet formation process and the planet-disk interaction.\n LOCATION:Colloquium Zoom room END:VEVENT END:VCALENDAR