Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt........24s&link_type=abstract
Proquest Dissertations And Theses 2008. Section 0010, Part 0606 257 pages; [Ph.D. dissertation].United States -- Arizona: Arizo
Physics
1
Star Formation, Low-Mass Stars, Milky Way, H Ii Regions, Galaxies
Scientific paper
Most studies of low-mass star formation have focused on regions such as Taurus- Auriga where stars form in relative isolation, but this is likely not the dominant mode of low-mass star formation. Instead a majority of stars form in rich cluster environments with both high and low-mass stars, and the effects of the massive stars can influence how successive generations of low-mass stars form. This dissertation presents the results from four studies of specific H II regions using new data from the Spitzer Space Telescope along with a study of the overall surface distribution of Young Stellar Objects (YSOs) in the Galactic mid-plane using archival Spitzer data. Understanding the relationship between high and low-mass stars is very important in order to better understand how star formation proceeds in these rich environments. In each study YSOs are identified, and the spatial distribution of these objects are measured. The distributions show that there is a correlation between the locations where YSOs are forming and the locations of ionization fronts created by the nearby massive stars. Shock fronts traveling in advance of ionization fronts will compress the molecular gas and will likely trigger further generations of low- mass stars. The advancing ionization front will also have an affect on how the young protostars are formed. Spectral Energy Distribution (SED) fitting is performed on all candidate YSOs in order to determine best-fit physical properties for each source. These properties along with the distribution of the YSOs are used to calculate the amount of triggered star formation occurring in each region. Calculated triggered star formation rates range from 14 - 58 percent of the total star formation rate, demonstrating that triggering of low- mass stars is occurring in multiple H II regions.
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