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19 April 2024 |
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Ices in Star-Forming Regions: First Results from VLT-ISAAC | | E.F. van Dishoeck
; E. Dartois
; W.F. Thi
; L. d’Hendecourt
; A.G.G.M. Tielens
; P. Ehrenfreund
; W.A. Schutte
; K. Pontoppidan
; K. Demyk
; J. Keane
; A.C.A. Boogert
; | | Date: |
20 Oct 2001 | | Subject: | astro-ph | | Affiliation: | Leiden), E. Dartois (Paris), W.F. Thi (Leiden), L. d’Hendecourt (Paris), A.G.G.M. Tielens (Groningen), P. Ehrenfreund (Leiden), W.A. Schutte (Leiden), K. Pontoppidan (Leiden), K. Demyk (Paris), J. Keane (Groningen), A.C.A. Boogert (Caltech | | Abstract: | The first results from a VLT-ISAAC program on L- and M-band infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows high S/N spectra of low-luminosity sources to be obtained. In our first observing run, low- and medium-resolution spectra have been measured toward a dozen objects, mostly in the Vela and Chamaeleon molecular clouds. The spectra show strong absorption of H2O and CO ice, as well as weak features at `3.47’ and 4.62 mu. No significant solid CH3OH feature at 3.54 mu is found, indicating that the CH3OH/H2O ice abundance is lower than toward some massive protostars. Various evolutionary diagnostics are investigated for a set of sources in Vela. | | Source: | arXiv, astro-ph/0110465 | | Services: | Forum | Review | PDF | Favorites | |
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