SWS observations of young main-sequence stars with dusty circumstellar disks.

C. Waelkens, L. B. F. M. Waters, M. S. de Graauw, E. Huygen, K. Malfait, H. Plets, B. Vandenbussche, D. A. Beintema, D. R. Boxhoorn, H. J. Habing, A. M. Heras, D. J. M. Kester, F. Lahuis, P. W. Morris, P. R. Roelfsema, A. Salama, R. Siebenmorgen, N. R. Trams, N. R. van der Bliek, E. A. ValentijnP. R. Wesselius

OnderzoeksoutputAcademicpeer review

195 Citaten (Scopus)

Samenvatting

We present SWS full-scan observations of three objects that are thought to be in a stage of evolution between the youngest, embedded, Herbig Ae/Be stars and Beta Pictoris, a young main-sequence star with a circumstellar disk. The 8-12μm spectra of all three stars cannot be understood in terms of purely amorphous silicates, but require the presence of crystalline silicates in different amounts. Around two objects both oxygen-rich and carbon-rich dust particles are present: the spectrum of HD 100546 displays the full set of UIR features; in the spectrum of HD 142527 both the 3.29 and 3.42μm emission features are observed, as well as a strong 3.51μm feature. The spectrum of HD 100546 is extremely rich in silicate features in the spectral range from 20 to 45μm; some of these features strongly suggest the presence of appreciable amounts of crystalline silicates.
Originele taal-2English
Pagina's (van-tot)L245-L248
TijdschriftAstronomy and astrophysics
Volume315
StatusPublished - 1-nov-1996

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