Abstract
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.
Original language | English |
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Pages (from-to) | L245-L248 |
Journal | Astronomy and astrophysics |
Volume | 315 |
Publication status | Published - 1-Nov-1996 |
Keywords
- CIRCUMSTELLAR MATTER
- STARS: INDIVIDUAL: HD 100546
- STARS: INDIVIDUAL: HD 142527
- STARS: INDIVIDUAL: 51 OPH
- ISM: ABUNDANCES
- INFRARED: ISM: LINES AND BANDS