AST 309 Lecture Notes - Lecture 10: Protoplanetary Disk, Protostar, Oxyhydrogen
Document Summary
In the late 1940"s, two astronomers independently observed emission from strange objects in star forming regions like orion, based on the spectra taken of these objects. The spectra showed only intense emission lines, didn"t look like normal stars or other observations of star forming regions with continuous spectra + absorption lines (black bands on top of the continuous spectrum). Did not look stellar like, but looked fuzzy and blob like in appearance. Couldn"t find star or protostar in the center. Appear in region sky near dark clouds, and young stars, but not classified as either. Maybe a transition stage between a cloud and young star. They didn"t remain fixed in sky, but had very high speeds, hundred of km/second. Others suggested that these observations were consistent with what would be expected from a shock wave created in the ism. A shock wave is produced when gas with very high speeds collides with other gas that has lower speeds.
