Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910515s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #105.15; Bulletin of the American Astronomical Society,
Other
Scientific paper
Lada and Lada (2003) found that as many as 90% of all low-mass stars within 2kpc of the Sun formed in clusters, and many of these clusters contain massive O and B stars. We are using Spitzer observations to independently asses the relationship between low and high-mass star formation. We are interested in exploring the extent to which HII region environments affect the process of low-mass star formation itself. In this poster, we present new Spitzer observations of the HII region NGC 2467. We present IRAC (3.6, 4.5, 5.8, and 8.0µm) and MIPS 24µm observations of this region, covering 600 square arcminutes. The images presented here show a region of ionized gas pushing out into the surrounding molecular cloud. The region is powered by an O6V star, there are also two other clusters of massive stars in the region. We have identified more than 50 sources that have infrared excesses in one or more mid-IR colors. Sources were defined to have an excess if [3.6]-[4.5] > 0.2 mags or if [5.8]-[8.0] > 0.5 mags. There are 30 sources that have an excess in two IRAC colors. We present color-color diagrams of the sources and also show the distribution of candidate Young Stellar Objects (YSOs). We find that YSOs are not randomly distributed in NGC 2467. Of the 30 sources with an infrared excess in two colors, more than 75% are located near the edge of the HII region in gas that has been compressed by HII region expansion. These Spitzer data support the hypothesis that a significant fraction of low-mass star formation in NGC 2467 is triggered by HII region expansion. Overall, there is a growing body of evidence to support the conclusion that low-mass star formation proceeds differently in massive star forming regions as compared to isolated dark clouds.
Bally John
Desch Steven J.
Healy Kevin R.
Hester Jeff J.
Snider Keely D.
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