Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30859m&link_type=abstract
Spitzer Proposal ID #30859
Physics
Scientific paper
The Orion A Molecular Cloud is one of the richest regions of star formation in the nearest kiloparsec.This 30 parsec long filament shows a remarkable gradient in star formation properties, from the rich cluster of low and high mass stars in the Orion Nebula, to the the small groups and isolated stars in Orion South. This gradient in star formation properties is correlated with changes in properties of the dense gas, specifically the gas kinetic temperature, turbulence, and column density. Using IRAC/MIPS onboard Spitzer, we have surveyed this cloud, and have identified a population of almost 300 probable protostars. We propose to observe 183 of these sources with the IRS, to obtain low resolution 5-36 micron spectra. Combining these spectra with photometry from IRAC, MIPS and sub-millimeter telescopes, we will constrain the properties of these protostars. We will search for variations in basic protostar properties, such as the mass accretion rate and rotation rate, to determine whether the properties of the protostars also change with cloud position. With this analysis, we hope to correlate the properties of the protostars with that of the gas - providing, perhaps, the first empirical determination of how the conditions of the dense gas influence the properties of the incipient stars.
Allen Lori
Calvet Nuria
Furlan Elise
Hartmann Lee
Megeath Tom
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