Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40321w&link_type=abstract
Spitzer Proposal ID #40321
Mathematics
Logic
Scientific paper
At a distance of only 1.3 kpc the embedded high mass cluster RCW 108-IR, powered by a pair of O stars (O6-O8), lies at the heart of an optically obscured, but highly IR-luminous region within the Ara OB1 association. Chandra observations detect over 400 X-ray sources in this region, but many lack near-infrared counterparts even in deep ground based observations - particular in the core of the embedded cluster. Detailed analysis of Chandra X-ray data of RCW 108 reveals the existence of at least 3 distinct regions actively forming stars in this complex - all may be triggered by winds or photoevaporation from the O stars at the center of NGC 6193. This hypothesis is supported by the association of each region with clouds of molecular gas and dust, and with clusterings of stars with K-band excess, with morphological structures indicative of an external influence. Here we propose to map this complex using IRAC and MIPS, and combine these data with our Chandra data with the following goals: 1) To probe for the most embedded objects within the young clusters and identify protostellar members, to obtain a complete census of young stars in the regions, and so to study the evolution of the the very young massive cluster RCW 108-IR and the nearby clustered regions. 2) To study the disk evolution among 4 related clusters (including the more evolved NGC 6193) to determine how environment effects disk evolution. 3) To examine the evidence for external influences on the evolution of these regions, and study the role of triggered star formation within them.
Bourke Tyler
Gutermuth Robert
Megeath Thomas S.
Melnick G. G.
Wolk Scott
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