Discovery of water vapour in the carbon star V Cygni from observations with<i>Herschel</i>/HIFI
Discovery of water vapour in the carbon star V Cygni from observations with<i>Herschel</i>/HIFI
We report the discovery of water vapour toward the carbon star V Cygni. We have used <i>Herschel<i/>'s HIFI instrument, in dual beam switch mode, to observe the 1<sub>11<sub/>–0<sub>00<sub/> para-water transition at 1113.3430 GHz in the upper sideband of the Band 4b receiver. The observed spectral line profile is nearly parabolic, …