Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541402b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #414.02; Bulletin of the American Astronomical Society, Vol. 42, p.254
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new images and photometry from regions in the massive star forming complex Cygnus-X North, part of the Spitzer Legacy Survey of Cygnus-X carried out with the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. A combination of IRAC, MIPS, UKIDSS, and 2MASS photometry are used to classify young stellar objects (YSOs) by their IR spectral energy distributions. Using optical spectra from 272 sources in the Cygnus-X North complex, we identify 20 B type stars. We find that YSOs tend to be clustered in H II regions around massive stars. We present a minimal spanning tree analysis of YSO clusters in Cygnus-X North. The fraction of infrared excess sources that belong to clusters with >10 members is found to be 50-70%. Most Class II objects lie in dense clusters within H II region cavities, while Class I sources tend to reside in more filamentary structures along the bright-rimmed clouds, indicating possible triggered star formation. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.
Beerer Ingrid M.
Hora Joe
Koenig Xavier
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