Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..b605r&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #B6.05
Physics
Scientific paper
The early stages of stellar evolution appear to be characterized by strong, highly collimated bipolar ejections that give origin to the Herbig-Haro objects and to the molecular outflows. The outflow phenomenon appears to be present for young stars of all masses and may be responsible for stopping accretion during the star formation process and for maintaining the turbulence of molecular clouds. Within one arcsec from the young star, the collimated outflow is (partially) shock-ionized and can be detected in the radio via its free-free (thermal) emission. These thermal radio jets provide one of the best observational tools to study the outflow phenomenon close to its origin. Interferometric observations of high sensitivity have been successfully used to 1) detect and locate with great precision the highly obscured exciting sources of outflows, 2) establish that the jets are collimated already within a few AU from the star, 3) study short timescale (months to years) variations in the outflow and 4) compare the orientation of the outflow on physical scales varying by 10^4 and allowing the search for precession in the jets. We discuss recent results in the study of thermal jets, mostly from Very Large Array observations.
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