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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 usually classified using criteria based on the slope of their SED, introduced by Lada C.J. in 1987. He proposed three classes (I, II and III), based on the values of intervals of spectral index :

.

Here is wavelength, and is flux density.

The is calculated in the wavelength interval of 2.2–20 (near- and mid- infrared region). Later Greene et al. in 1994 added a fourth class of "flat spectrum" class sources. In 1993 Andre et al. discovered class 0—objects with strong submillimeter emission, but very faint at .

This classification schema roughly reflects evolutionary sequence. It is believed that most deeply embedded Class 0 sources evolve towards Class I stage dissipating their circumstellar envelopes. Eventually they become optically visible on the stellar birthline as pre–main sequence stars.

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

References

  • Lada, C. J. (1987), IAU Symposium 115: Star Forming Regions, 115, 1
  • Greene, Thomas P.; Wilking, Bruce A.; Andre, Philippe; Young, Erick T.; Lada, Charles J. (1994), Further mid-infrared study of the rho Ophiuchi cloud young stellar population: Luminosities and masses of pre-main-sequence stars, The Astrophysical Journal, vol. 434, pp. 614–626
  • Andre, Philippe; Ward-Thompson, Derek; Barsony, Mary (1993), Submillimeter continuum observations of Rho Ophiuchi A – The candidate protostar VLA 1623 and prestellar clumps, The Astrophysical Journal, vol. 406, pp. 122–141

See also

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