Inferring past accretion bursts from asteroseismic imprints

Recording: https://www.oact.inaf.it/seminars/

DATE: Monday, February 23, 11:30 a.m.

ORGANIZER: INAF-OACT

LOCATION: AULA OVEST (INAF-OACT) + remote

Link for the remote audience:
https://meet.google.com/wvf-uwxo-oyj

SPEAKER:Johannes Jørgensen (Innsbruck University)

ABSTRACT:
Stars form during the collapse of dense molecular cloud cores. However, most of their final mass comes from the ensuing protostellar disk, owing to non-zero angular momentum in the cloud. Here, the protostar gains up to 50% of its final mass in episodic bursts of mass accretion, while having quiescent phases between the bursts. In this presentation I present a study of how the occurrence of such bursts may be inferred using asteroseismology – the study of stellar pulsations. Specifically, I show how these intense episodes leave a detectable asteroseismic imprint in the deep stellar interior.

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