Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..283k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 283-295.
Astronomy and Astrophysics
Astronomy
26
Herbig-Haro Objects, Infrared Astronomy Satellite, Interstellar Matter, Molecular Flow, Pre-Main Sequence Stars, Stellar Mass Ejection
Scientific paper
Results are presented of (C-12)O (J = 1-0) and (C-13)O (J = 1-0) observations of HH 52-54. Two molecular outflows associated with HH 52-54 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 IRAS sources as the exciting stars of the HH objects. The well-collimated outflow associated with the HH 54 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 our data to other observations permits us to construct a scenario of the star formation and mass loss activity near HH 52-54. The observed high ratios of outflow mechanical luminosity to stellar luminosity provide a stringent test of current theories for the outflow driving mechanism: in the case of the HH 52-54 outflows, we conclude that they are probably in an energy-driven mode, and that Alfven wave-driven stellar winds from convective low-mass stars is the most likely driving mechanism.
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