Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944409a&link_type=abstract
American Astronomical Society, AAS Meeting #219, #444.09
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of a star formation region G38.91-0.42 at a distance of 2.3 kpc that appears to be forming, at most, intermediate-mass stars. We have gathered data from multiple space-based and ground based surveys that covers the entire infrared regime from 1 to 500 um, as well as some millimeter and radio wavelengths. We have constructed a complete picture of star formation by identifying possible main sequence star clusters, young stellar objects (YSOs), and clumps of dense SF material. Over 150 YSOs have been found and classified by fitting model SEDs. We demonstrate a possible correlation between YSO mass and the column density of molecular gas & dust. There is also evidence for an anti-correlation between YSO age and dust column density. Our analysis shows that this region exhibits a much higher ratio of young stage I YSOs to older stage II YSOs suggesting that G38.91-0.42 is extremely young. We have also searched for evidence of triggered star formation near the limb-brightened bubbles/shells seen in mid-IR images. The lack of young YSOs within the the IR bubbles, and the collection of dense gas on the bubbles' rims is broadly consistent with the collect-and-collapse model, where the bubbles are still too young to have formed the next generation of stars. This work represents the first stage of a larger program designed to study triggered star formation in star forming regions covering a wide range of stellar energy and molecular gas properties.
Alexander Michael
Arvidsson Kim
Kerton Charles
Kobulnicky Henry
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