Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335604k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #356.04; Bulletin of the American Astronomical Society, Vol. 41, p.498
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of an extensive Spitzer Space Telescope imaging survey of the W5 H II region with the Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS). We find clear evidence for multiple generations of star formation in W5: dense clusters of young stars surround the O stars within the H II region cavity, and younger, embedded clusters are visible on the nearby molecular cloud. Our analysis shows that triggering is a likely mechanism to explain this sequence. With photometry of more than 18000 point sources, we analyze the clustering properties of objects classified as young stars by their IR spectral energy distributions (a total of 2064 sources) across the region using a minimal-spanning-tree algorithm. We find 40 to 70 % of infrared excess sources belong to clusters with >10; members. We also show evidence of feedback by massive star ionizing radiation on young star disks: at mid-infrared wavelengths we see dusty cometary tails around low mass stars. Lastly we show initial results from our survey of intermediate-mass star disks.
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