Discovery of water vapour in the carbon star V Cygni from observations with Herschel/HIFI

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Table 2:

Derived parameters for V Cygni.
Model A: Water inner radius = $4.5 \times 10^{14}~\rm cm$
Para-water abundance relative to H₂: $5.3 \times 10^{-7}$
Total water abundance^a relative to H₂: $2.1 \times 10^{-6}$
Total water outflow rate: $3 \times 10^{-5}$ Earth mass/yr
Model B: Water inner radius = $2 \times 10^{15} ~ \rm cm$
Para-water abundance relative to H₂: $1.0 \times 10^{-6}$
Total water abundance^a relative to H₂: $4.2 \times 10^{-6}$
Total water outflow rate: $6 \times 10^{-5}$ Earth mass/yr

Notes. ^(a) For an assumed ortho-to-para ratio of 3.

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