Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910507n&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #105.07; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We have discovered a population of young stars in the young stellar cluster NGC 602 in the Small Magellanic Cloud (SMC), from observations with the Hubble Space Telescope (HST) and the Spitzer Space Telescope (SST). NGC 602 is located in the SMC's wing, a low density region far from the main body of the galaxy, low in both gas and stellar content and displaying the low chemical abundance of the SMC. Deep optical imaging from the Advanced Camera for Surveys (ACS) aboard the HST has revealed the existence of an extensive and distinct pre-Main Sequence population, with stellar masses in the range 0.6–3 Mo.. These pre-Main Sequence stars formed coevally with the central cluster approximately 5 Myr ago.
A second population of young stellar objects (YSOs) is revealed by SST images of the region in all four bands of the Infrared Array Camera (IRAC). These very young objects formed even more recently than the stars seen in HST/ACS images, and some are still embedded in dust and gasl. We infer that star formation started in this region 5 Myr ago with the formation of the central cluster, and propagated outwards over a timescale of a couple of Myr.
Carlson Lynn Redding
Clampin Marc
Gallagher III J.
Hora Joseph L.
Meixner Matthew
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