Computer Science
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..219p&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Computer Science
Vega-Type Stars, Pre-Main Sequence Stars, Iso-Sws, Silicate Features
Scientific paper
We present a preliminary analysis of ISO-SWS spectra of a sample of Vega-type and pre-main sequence stars, which were observed from the ground in a project devoted to the study of formation and evolution of planetary systems, carried out during the 1998 International Time of the Canary Islands Observatories. ISO-SWS covers many interesting features expected to be present in Vega-type and pre-main sequence objects. Most of the Vega-type stars shows photospheric spectral energy distributions up to ≈ 10 μm, while an IR excess is normally observed at wavelengths larger than ≈ 20 μm. Pre-main sequence (PMS) stars usually shows IR excesses along the whole SWS spectral range. The 10 μm silicate feature is observed in emission towards most of the PMS stars, while it is observed in only one Vega-type star in our sample, 51 Oph. The comparison of the silicate features observed towards the protoplanetary systems with the silicate band profiles of the Trapezium and comet Kohoutek suggests a better agreement with the solar system cometary silicates.
Alberdi Antonio
Collier Cameron Andrew
Davies John K.
de Winter Dolf
Deeg Hans-Joerg
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