Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9231635k&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
A Stars, Herbig-Haro Objects, Infrared Astronomy Satellite, Molecules, Pre-Main Sequence Stars, Star Formation, Stellar Evolution, Stellar Luminosity, Stellar Mass Ejection, Stellar Winds, Convection, Interstellar Matter, Losses, Magnetohydrodynamic Waves, Mass
Scientific paper
Results are presented of CO-12(J = 1-0) and CO-13(J = 1-0) observations of HH52-54. Two molecular outflows associated with HH52-54 have been discovered. The column density structure of the cloud and the alignments of the molecular and optical outflows lead us to identify two faint Infrared Astronomy Satellite (IRAS) sources as the exciting stars of the HH objects. The well-collimated outflow associated with HH54 optical 'streamer' confirms that the streamer is an optical jet. A third, weaker outflow is associated with the Herbig Ae star IRAS 12496-7650. Comparison of the data to other observations permits one to construct a scenario of the star formation and mass loss activity near HH52-54. The observed high ratios of outflow mechanical luminosity to stellar luminosity provide a stringet test of current theories for the outflow driving mechanism: in the case of the HH52-54 outflows, the authors conclude that they are probably in an energy-driven mode, and that Alfven wave-driven stellar winds from convective low-mass stars are the most likely driving mechanism.
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