Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513508m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #135.08; Bulletin of the American Astronomical Society, Vol. 32, p.883
Astronomy and Astrophysics
Astronomy
Scientific paper
We present low-resolution mid-infrared spectra of nine classical T Tauri stars associated with the Chamaeleon I dark cloud. The data were obtained with the PHOT-S instrument on-board the Infrared Space Observatory (ISO) in the two wavelength ranges 2.5-4.9 and 5.9-11.7 microns. All nine stars show evidence of silicate emission at 10 microns, which is the only prominent feature in the spectra. We discuss a model for the origin of these features in a hot optically-thin surface layer of the circumstellar disks surrounding the central young stars (i.e. a disk atmosphere). We report excellent agreement of our observations with predictions based upon this simple model for most stars in our sample, assuming that a mixture of amorphous silicates of radius < 1 micron is the dominant source of opacity. These observations support the notion that extended disk atmospheres contribute substantially to the mid-IR flux of young stars.
Beckwith Steve V. W.
Meyer Michael R.
Natta Antonella
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