Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940702p&link_type=abstract
American Astronomical Society, AAS Meeting #219, #407.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from a study of a large sample of Bok globules and bright-rimmed clouds (BRCs) that have been observed with the NASA Spitzer Space Telescope. We identify and classify young stellar objects (YSOs) using Spitzer and near-infrared 2MASS photometry, and will present the ratio of Class I to Class II YSOs in each of the regions. In addition, near-infrared extinction maps will be presented. The stellar populations will be used, along with the known gas masses of these clouds to estimate the fraction of the gas from a molecular cloud that typically ends up as stars. The initial conditions for the formation of a single star, binary or cluster of stars can be constrained, and with an estimate of the age from theoretical models, the time it takes a star (or a cluster of stars) to form can also be constrained, as well as the timescales for the various evolutionary states. The Bok globules are unique because they are simple environments, free from the confusing effects of winds and external turbulence that are often seen in young clusters embedded within larger, star-forming complexes. By studying a large number of these simple structures spanning a wide range of evolutionary states, and comparing their properties with those of the more complex BRCs, which are strongly influenced by nearby O and B stars, we can ultimately study the role that environment plays in star formation.
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