Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.245w&link_type=abstract
Astronomy and Astrophysics, v.315, p.L245-L248
Astronomy and Astrophysics
Astrophysics
188
Circumstellar Matter, Stars: Individual: Hd 100546, Stars: Individual: Hd 142527, Stars: Individual: 51 Oph, Ism: Abundances, Infrared: Ism: Lines And Bands
Scientific paper
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.
Beintema Douwe A.
Boxhoorn Danny R.
de Graauw M. S.
Habing Harm J.
Heras Ana M.
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