Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343918f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #439.18; Bulletin of the American Astronomical Society, Vol. 41, p.316
Mathematics
Logic
Scientific paper
The formation of mamy stars in the Galaxy appears to be triggered by some external compression processes such as OB ionization, winds or supernovae shocks. However, quantitative understanding of triggering processes is still primitive. The radiation driven implosion (RDI) is currently considered as the most observationally testable model using bright rimmed clouds (BRCs) on the edges of large HII regions.
We have made several short observations with the Chandra X-ray Observatory to elucidate the mechanism, efficiency and stellar populations produced by small-scale triggered star formation around HII regions. X-ray selection is effective in tracing triggered low mass stars from protostellar through disk-free stages, both embedded in the cloud and in the unobscured cloud vicinity. The results of these studies are presented and generally support the RDI model. Triggering by HII region shocks is not restricted to a single episode, but can continue for millions of years. We discuss plans for the collection of BRC young star samples at different morphological stages of the triggering and cloud ablation process to test RDI predictions and to quantify the role of RDI in Galactic star formation.
Feigelson Eric
Getman Konstantin
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