Episodic accretion in focus: revealing the environment of FU Orionis-type stars

Fehér, Orsolya and Kóspál, Ágnes and Ábrahám, Péter and Hogerheijde, M. R. and Brinch, Ch. and Semenov, D. (2020) Episodic accretion in focus: revealing the environment of FU Orionis-type stars. PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION, 17 (S345). pp. 87-90. ISSN 1743-9213

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Abstract

The earliest phases of star formation are characterised by intense mass accretion from the circumstellar disk to the central star. One group o young stellar objects, the FU Orionis-type stars exhibit accretion rat peaks accompanied by bright eruptions. The occurance of these outburst might solve the luminosity problem of protostars, play a key role i accumulating the final star mass, and have a significant effect on th parameters of the envelope and the disk. In the framework of th Structured Accretion Disks ERC project, we are conducting a systemati investigation of these sources with millimeter interferometry to examin whether they represent normal young stars in exceptional times or the are unusual objects. Our results show that FU Orionis-type stars can b similar to both Class I and Class II systems and may be in a specia evolutionary phase between the two classes with their infall-drive episodic eruptions being the main driving force of the transition

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