Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-03-11
Astronomy and Astrophysics
Astrophysics
11 pages, uuencoded compressed postscript (including 9 figures), accepted for publication in Ap.J., IAUNAM_contrib.#340
Scientific paper
10.1086/174141
Detailed comparisons are made between observations of scattered light upstream of the head of the HH~1 jet and predictions of simple scattering models. It is shown that, in order to unambiguously determine the velocity of the head of the jet (bow shock) with respect to the upstream dust, existing spectroscopic observations are insufficient and that spectropolarimetric observations of the scattered light are necessary. Such an independent measure of the bow shock velocity is important in order to test ``multiple outflow'' theories of Herbig-Haro jets. It is also shown 2that the scattering dust must have a very forward-throwing scattering phase function ($\langle\cos\theta\rangle\msim 0.7$) and slight evidence is found for a dust-gas ratio that is higher than average.
Axon David J.
Henney William J.
Raga Alejandro C.
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