The LWS spectrum of T Tauri

Details The LWS spectrum of T Tauri The LWS spectrum of T Tauri

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..517s&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 517

Physics

2

Stars: Circumstellar Matter, Stars: Pre-Main Sequence (T Tauri), Infrared: Spectroscopy, Molecular Emission

Scientific paper

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 ṡ 10-5 and an OH abundance of 3ṡ 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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