Bipolar Flow
Opposite directed jets of gas ejected by some protostellar objects.
BL Lac Object ...
It is interesting to note that the material is being ejected from the young star only in two directions, known as a bipolar flow. Why doesn't it just blow material out in a uniform direction or into a random direction?
The result is known as a bipolar flow"two "jets" of matter are expelled in the directions of the poles of the protostar, as illustrated in Figure 19.11.
However, Valerie Illingworth (Facts On File Dictionary of Astronomy) states that the variability of the nebula comes from what is called a bipolar flow of emissions originating from R Monocerotis.
As the bipolar flow from a young star plows into the surrounding gas, it generates strong shock waves that heat and ionize the gas.
In this stage bipolar flows are produced, probably to eliminate part of the angular momentum of the falling material. Finally, hydrogen ignites in the core of the star, and the rest of the enveloping material is cleared away.
 See also: Astronomy, Star, Transit, S Star, Solar
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