The LWS spectrum of T Tauri

Spinoglio, L.; Giannini, T.; Saraceno, P.; di Giorgio, A. M.; Nisini, B.; Pezzuto, S.; Palla, F.; Ceccarelli, C.; Lorenzetti, D.; Smith, H. A. and White, G. J. (1999). The LWS spectrum of T Tauri. In: The Universe as Seen by ISO, 20-23 Oct 1998, Paris, France, p. 517.



With the LWS spectrometer on-board the Infrared Space Observatory (ISO), we have detected toward T Tauri strong emission from high-J (J>14) CO, H2O and OH transitions over the wavelength range from 40 to 190 μm. In addition, the LWS spectrum shows the [OI]63 μm and 145 μm and [CII]158 μm atomic lines. The molecular emission can be explained by a single emission region at T 300-900 K and nH2 105-6cm-3, with a diameter of about 2-3 arcsec, corresponding to 300-400 AU (at the distance of 140 pc). We derive a water abundance of 1-3 •10-5 and an OH abundance of 3 •10-5 with respect to molecular hydrogen, implying H2O and OH enhancements by more than 10 with respect to the ambient gas abundance.

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