Bipolar Flows from Potostars

Protostars go through a stage with a strong stellar wind, which blows gas out into space. The gas typically goes out through the holes in the gas disk around the star. Where the jets hit gas clouds, they make the clouds glow. (The bright nebula is then called a Herbig-Haro object.)

HH30 jets.
HH47 jets.
Three jets as seen with the HST.
HH1 and HH2.

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA soper@bovine.uoregon.edu