Young stellar object

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Young stellar object (YSO) denotes a star in its early stage of evolution.

This class consists of two groups of objects - protostars and pre-main sequence stars. Sometimes they are divided by mass - massive YSO (MYSO), intermediate mass YSO and brown dwarfs.


YSO are also associated with early star evolution phenomena: circumstellar jets and bipolar outflows, masers, Herbig-Haro objects, protoplanetary disks (circumstellar disks or proplyds).

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