HCN transition were
simultaneously observed. The source of vibrationally excited SiS
appears resolved, and a source size of 
or 
cm
(10 stellar radii) is derived, in agreement with a crude model of
line formation (Fig. 3).
Figure 3: Left: SiS (v=1) line emission for IRC+10216: Real part of
visibility versus antenna spacing in m . Line channels between -32 and -22
kms 
have been averaged, and the continuum has been subtracted.
Right: Gaussian fit parameters to the SiS line emission, as a function
of velocity: Full width at half maximum and
line flux, as a function of LSR velocity. The continuous line shows the
line parameters predicted by the model.
