Jets from young stars - CCD imaging, long-slit spectroscopy, and interpretation of existing data

Details Jets from young stars - CCD imaging, long-slit spectroscopy, and interpretation of existing data Jets from young stars - CCD imaging, long-slit spectroscopy, and interpretation of existing data

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..275m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 275-303. Research supported by the Alexander von Humb

Other

297

Plasma Jets, Pre-Main Sequence Stars, Spectrum Analysis, Stellar Mass Ejection, Stellar Spectra, Charge Coupled Devices, Herbig-Haro Objects, Spatial Resolution

Scientific paper

High-velocity jets and collimated outflows are now recognized as phenomena commonly associated with young stars. New CCD imaging of five objects, and in particular spatially resolved spectroscopy of eight highly-collimated flows, are discussed. Through the CCD imaging, three new jets have been discovered. It is shown that several previously known Herbig-Haro objects have extended bow-shock-like structures. In most of the latter cases, a jet is pointing from the star toward the bow-shock apex. The concave side of the bow-shock structure is in all cases oriented toward the outflow source. Using a data base of about 20 known jets, a detailed list of observational criteria describing these phenomena is compiled. A physical description and interpretation is presented which discusses the origin of knots in these jets and other structures, the relationship between jets and Herbig-Haro objects, the dissipation of energy along the jet due to internal shocks, the physical parameters, the relationship of optical jets to molecular outflows, and time scales for outflow activity. A short discussion of the driving sources for these jets is also included.

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