Ss 1999 2000 2001 2002 2003 2004 2005

Fig. 2. Young stellar objects observed by interferometry in the period 1998-2005. from [4]

Figure 2 shows that with improved facilities there is an increase in the number of published results. We are in an epoch where interferometry is opening itself to fainter targets allowing YSOs, including the brightest Herbig Ae/Be stars, the fainter T Tauri stars, and the few FU Orionis stars to be observed at milli-arcsecond scales. While these observations are made mainly in the near-infrared wavelength domain, some are made in the mid-infrared. The readers should refer to the review [4] for examples of what can be performed with modern optical interferometric techniques in the field of YSOs.

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