Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt.........6d&link_type=abstract
Thesis (PHD). UNIVERSITY OF COLORADO AT BOULDER , Source DAI-B 58/07, p. 3688, Jan 1998, 187 pages.
Computer Science
6
Molecular Clouds
Scientific paper
We have recently discovered over two dozen examples of parsec length Herbig-Haro (HH) flows driven by relatively low mass stars in the Orion, Taurus, Cepheus and Perseus molecular cloud complexes. These giant HH flows are up to a factor of ten longer and older than previously believed, and are depositing energy and momentum directly into the interclump medium of the surrounding molecular cloud. Giant HH flows are capable of heating, ionizing, and dissociating cloud material over parsec scale distances and may play a role in producing the turbulent motions observed in molecular clouds. Giant HH flows also provide a fossil record of the outflow behavior and mass loss rate from a young star over a significant fraction of the 105 year outflow phase, and provide indirect clues to the accretion history of the forming star. All of the HH flows that we observed exhibit some type of variability, either in ejection direction or speed, on time scales ranging from decades to tens of thousands of years. There is evidence that the amplitudes and frequencies of these variations are inversely related. We present observational and kinematical evidence that these flows are ubiquitous and discuss their possible impact on star formation and the interstellar medium.
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