Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5702c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #57.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
Spectra with R=100 have been obtained between 8 and 13 μm of 11 high-mass protostellar objects (HMPOs) using MIRSI on the IRTF. The HMPOs are members of the survey of Sridharan (2002 ApJ 566, 931) that we had first found to be bright and compact in N band (10.5 μm) and 24.8 μm imaging on the IRTF. The spectra fall in three groups: 1. Deep silicate (9.7 μm) absorption with strong emission at both 8 and 13 μm (5 HMPOs), 2. Weak silicate absorption with a weak peak at 8.5 μm, and stronger emission at 13 μm (2 HMPOs), and 3. Approximately flat emission at 8 μm, rising to longer wavelengths (4 HMPOs). Spectra of members of each group are presented. We also present simple three component models that fit the spectra and the 24.8 μm photometry. The model components are hot dust in emission, warm dust in emission, and cold dust in extinction. The hot and warm components give estimates of the amount of gas and dust near each HMPO. The cold component gives estimates of the overlying column density and Av to each HMPO.
Beuther Henrick
Brooks Ryland T.
Campbell Murray F.
de Buizer James M.
Fung Shing
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