ISO-LWS grating spectroscopy: the case of R CrA star forming region

Giannini, T.; Lorenzotti, D.; Benedettini, M.; Nisini, B.; Saraceno, P.; Tommasi, E.; Smith, H. A. and White, G. J. (1998). ISO-LWS grating spectroscopy: the case of R CrA star forming region. In: Star Formation with the Infrared Space Observatory, 24-26 Jun 1997, Lisbon, Portugal.



We present the far infrared spectra of the R CrA star forming region obtained with ISO-LWS. We collected a pointed observation on the Herbig Ae star R CrA and a raster scan covering the surrounding region, where HH100 (with its exciting source) and the pre-Main Sequence star T CrA are located. The OI 63μm and the CII 158μm lines have been detected in all the pointed positions, with a ratio consistent with PDR excitation. CO rotational lines (between Jup=14 and Jup=19) are detected on R CrA; from their intensities we derived, using a LVG model, the density and temperature of the emitting region. Other molecular transitions (OH and H2O) have been detected on the investigated objects; the derived cooling of all the molecular species is in agreement with C-shock as the likely excitation mechanism. The continuum emission of R CrA peaks around 100μm (as expected for a Herbig star) while the other sources (T CrA, HH100) show increasing continua up to ~200μm, indicating that they are probably less evolved sources.

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