Bringfried Stecklum
TLS Tautenburg
The crucial role of FIR measurements for characterizing MYSO accretion bursts
Massive young stellar objects (MYSOs) are deeply embedded throughout most of their evolution. Therefore, their spectral energy distribution peaks at far-infrared (FIR) wavelengths. In recent years, the first accretion bursts of these objects have been witnessed. A brief summary of these events is given. To verify the burst presence and derive the accreted mass, the increase in luminosity and its temporal change must be measured. SOFIA was the only facility available for this purpose. A brief summary of these diverse events is given. In this regard, two important topics are discussed. Depending on the dust distribution and viewing geometry, MYSO bursts may exhibit an IR afterglow that delays the release of the burst energy. The second aspect is related to the high multiplicity of MYSOs, which SOFIA was unable to account for. It emphasizes the need for high spatial resolution in the FIR to provide data that match those from JWST and ALMA.
