Astrophysics (Index)About

young stellar object

(early stage of a star)

A young stellar object (YSO) is a star in the early stages of development, i.e., a protostar or a pre-main-sequence star. They can be hard to see because their normal environment, a star-forming region usually suffers from extinction, so, for example, they are often not recorded by Gaia. Fortunately, some have significant magnetic fields and are radio sources (radio YSOs).

Classes of YSOs:

Where α is its "wavelength" spectral index:

α = —————————

Where λ is the wavelength and Fλ is the flux density.

The classes roughly follow the evolution. They also often have jets, circumstellar disks, etc.

The abbreviation MYSO is used for massive young stellar objects, the presumed precursors of massive stars such as O-type stars and B-type stars.

(star type,stellar evolution)
Further reading:

Referenced by pages:
bipolar outflow
Elias 2-27
failed binary
falling evaporating body (FEB)
Gould's Belt Distances Survey (GOBELINS)
Gould's Belt
Herschel Orion Protostar Survey (HOPS)
I band
Palomar Transient Factory (PTF)
Spitzer Space Telescope (SST)