Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..231r&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
Scientific paper
We report early results from a mid-IR imaging survey of the Orion Nebula carried out at the UKIRT telescope. Using the MPIA 5-25μm camera MAX and the facility instrument IRCAM-3, we obtained 3, 5 and 10 μm images with sub-arcsecond seeing of 9 fields centered on dark silhouette or externally photoionized (``proplyd'') sources. Thermal emission is detected from a large fraction of the objects falling within our fields. Absolute photometry indicates that thermal emission is generally in excess with respect to the stellar photosphere. This result suggests that a vast majority of the Orion Nebula Cluster members still retain their disks at distance of order 1 AU. Our data, combined with the most recent results obtained at visual and near-IR wavelengths, allow us to constrain the disk-heating mechanisms (accretion vs. disk photosphere) and the relevance of the interstellar radiation field, mostly originated by the O6p star θ1C, vs. the disk's central star as the major source of external energy input.
Beckwith Steve V. W.
Herbst Thomas M.
Robberto Massimo
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