Shanghai Astronomical Observatory Astrophysics Colloquium

Title：The Role of Protostellar Variability in Stellar Mass Assembly

Speaker:Gregory Herczeg (KIAA/Peking University)

Time：3:00 pm Sep. 04th (Thursday)

Tencent Meeting：935-4851-5097 password: 6360

Location: Lecture Hall, 3rd floor

Abstract：

Young stellar objects are notoriously variable.  The largest amplitudes are seen on FU Ori objects, bursts of a factor of ~1000 in accretion rate that may last for centuries.  However, the importance of such large bursts in stellar assembly remains uncertain.  In this talk, I will discuss the role that variability plays at the different stages of evolution of young stellar objects and consequences for planet formation.  I will highlight the JCMT Transient Program, the first dedicated sub-mm monitoring program, to measure the role of bursts in the earliest stages of stellar assembly, and will discuss future prospects for protostellar monitoring.

CV：

Gregory Herczeg is a Professor and Associate Director of Science at the Kavli Institute for Astronomy and Astrophysics at Peking University, where he has worked since 2011.  He also serves as a Science Editor for AAS Journals and was the Chair of the Science Advisory Committee for the Thirty Meter Telescope from 2020-2022.  He received his PhD from University of Colorado in 2005 under the supervision of Jeff Linsky, and subsequently worked as a postdoc at Caltech with Lynne Hillenbrand and at Max Planck Institute for Extraterrestrial Physics with Ewine van Dishoeck.  He is an expert in observational studies of star and planet formation, with over 250 co-authored publications.