Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..228s&link_type=abstract
Nature (ISSN 0028-0836), vol. 325, Jan. 15, 1987, p. 228-230. Research supported by the Ministero della Pubblica Istruzione and
Astronomy and Astrophysics
Astronomy
15
Astronomical Models, Molecular Clouds, Nebulae, Emission Spectra, Kelvin-Helmholtz Instability, Molecular Flow, Protostars, Stellar Envelopes, Stellar Winds
Scientific paper
Collimated outflows of high-velocity gas, with typical scale lengths of 0.01 - 0.2 pc, are often observed to be associated with linear chains of optical emission knots, sometimes connected by faint nebulosities. The flows have been ascribed to the interaction between an energetic wind ejected by a young stellar object and circumstellar material. The authors suggest here a new interpretation of the phenomenon, based on flows in a channel of variable cross-sectional area due to Kelvin-Helmholtz instabilities between the flow and the ambient medium. They present solutions of the Mach number equation for such a channel, which possess multiple critical points and shocks identified with the observed optical knots.
Ferrari Aldo
Rosner Robert
Silvestro G.
Trussoni Edoardo
Tsinganos Kanaris
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