Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.2049f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Dec. 1991, p. 2049-2053.
Astronomy and Astrophysics
Astronomy
5
Herbig-Haro Objects, Radio Jets (Astronomy), Stellar Winds, Early Stars, Imaging Techniques, Simulation, Stellar Mass Ejection
Scientific paper
In many cases, the sources of jetlike Herbig-Haro objects are optically invisible, embedded objects which are usually detected at infrared wavelengths. The jets become visible only at distances of about 10 exp 16-17 cm from the source, where they emerge from the molecular cloud core that surrounds the central object. High spatial resolution images indicate that close to the position where the jets appear, their width is a decreasing function of distance from the source. A string of linearly aligned emitting knots that emerges from a stratified medium is simulated. For this configuration, the single scattering of photons is calculated in order to obtain intensity maps of the scattered + direct light that reaches the observer. It is found that the observed width as a function of position close to the source in stellar jets can be reproduced from these calculations. It is concluded that the effect of broadening toward the source observed in some stellar jets is the result of light scattered from the near environment of the jet, and not an actual hydrodynamic effect of the jet flow.
Feldman Hume A.
Raga Alejandro C.
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