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Table 4

SiO ring diameters.

ν = 1 a ν = 2 b
Source Diam Width Fract Diam Width Fract
mas mas mas mas

W Cnc 9.8 0.8 0.80 7.8 0.8 0.58
RX Tau 11.2 0.6 0.77 10.8 0.6 0.86
S Ser 9.0 0.7 0.86 7.2 0.5 0.82
RT Aql 14.5 1.0 0.70 13.7 0.8 0.75

U Ari 7 7
V Mon 10

Notes. No ring could be fitted for U Ari and V Mon, but smallest possible diameter values are given. Fract is the fraction of the emission in the ring.

(a)

ν = 1, J = 1−0 transition of SiO at 43.1 GHz;

(b)

ν = 2, J = 1−0 transition of SiO at 42.8 GHz.

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