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Title:
ISO-LWS Grating Spectroscopy: The Case of R CrA Star Forming Region
Authors:
Giannini, T.; Lorenzetti, D.; Benedettini, M.; Nisini, B.; Saraceno, P.; Tommasi, E.; Smith, H. A.; White, G. J.
Affiliation:
AA(IFSI - CNR, Frascati, Italy), AB(IFSI - CNR, Frascati, Italy), AC(IFSI - CNR, Frascati, Italy), AD(IFSI - CNR, Frascati, Italy), AE(IFSI - CNR, Frascati, Italy), AF(ISO Science Operation Centre - Villafranca, Madrid, Spain), AG(Harvard-Smithsonian Center for Astrophysics - Cambridge, USA), AH(Queen Mary & Westfield College - London, UK)
Publication:
Star Formation with the Infrared Space Observatory, 24-26 June 1997, Lisbon, Portugal, edited by Joao Yun and Rene Liseau, Publisher: ASP, as volume 132 of ASP Conference Series. P. 350.
Publication Date:
00/1998
Origin:
AUTHOR
Keywords:
CIRCUMSTELLAR MATTER, PRE-MAIN-SEQUENCE STARS, FAR-IR SPECTROSCOPY
Bibliographic Code:
1998ASPC..132..350G

Abstract

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 63 microns and the CII 158 microns 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 100 microns (as expected for a Herbig star) while the other sources (T CrA, HH100) show increasing continua up to ~200 microns, indicating that they are probably less evolved sources.

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