Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30601t&link_type=abstract
Spitzer Proposal ID #30601
Computer Science
Scientific paper
We propose to perform a spectral survey with Spitzer-IRS at low- and high-spectral resolution of a sample of intermediate-mass young stellar objects ---the precursors of Herbig Ae/Be stars--- located in the Vela molecular cloud. Young stellar objects in the Vela molecular cloud provide an unique opportunity to study star-formation in the galactic plane in a luminosity range that has not been probed before. The main objectives of the program are: i) to establish an inventory of solids (silicates and ices); ii) to study their spatial variation throughout the envelopes; iii) to search for faint absorption features. The high quality spectra will allow a detailed study of the shape of the ice features (for example H2O ice at 6 micron, NH4+/CH3OH at 6.85 micron, CH4 at 7.6 micron, CO2 band at 15.2 micron and PAH emission. The shape of the CO2 ice bending mode is for instance a sensitive probe of the thermal history of the ices and is related to the formation of dioxide/methanol complexes. The study of the solid species will provide unprecedented constraints on chemical and radiative models of envelopes. Together with ground-based complementary spectra at lower wavelengths, the sample will constitute the first detailed spatial and spectral study of the solid content in envelopes around intermediate-mass young stellar objects, and provide crucial data for follow-up studies with Herschel.
Dartois Emmanuel
Thi Wing-Fai
van Dishoeck Ewine
Wright Christopher
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