Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341312c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #413.12; Bulletin of the American Astronomical Society, Vol. 41, p.222
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a study of progressive Star Formation in young Magellanic Cloud clusters by examining their stellar and protostellar populations across a range of wavelengths. Infrared data from the SAGE (Surveying the Agents of a Galaxy's Evolution) Spitzer Legacy programs SAGE-LMC and SAGE-SMC are complemented by HST optical imaging, Magellanic Clouds Photometric Survey optical photometry, and near-IR data from the IRSF (InfraRed Survey Facility) Magellanic Clouds Point Source Catalog. Optical stellar populations are dated via the examination of Color-Magnitude Diagrams and comparison to theoretical isochrones. Embedded, infrared bright Young Stellar Objects (YSOs) are explored through the use of T. Robitaille's Spectral Energy Distribution fitter. We couple this analysis with the consideration of star forming environments as revealed through imaging across the optical and infrared wavelength regimes. Most embedded YSOs are found in the peripheral regions of clusters in which young Main Sequence stars dominate the optical, suggesting a progression of star formation. A detailed study of the young cluster NGC 602 in the Wing of the SMC reveals a population of pre-Main Sequence, T-Tauri type sources and young Main Sequence stars at cluster center bordered by dusty arcs containing embedded YSOs. This indicates a probable progression of star formation from cluster center to edge over time scales of less than 5 Myrs. Our analysis also shows that several IR YSOs correspond to multiple optical sources, raising important questions about the ambiguity between sources observed in different wavelengths and resolutions. Preliminary results from LMC star formation regions, including N11, are also discussed.
The SAGE Project is supported by NASA/Spitzer grant 1275598 and NASA NAG5-12595.
Babler Brian
Block Martin M.
Carlson Lynn R.
Engelbracht Charles
Gallagher John S. III
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