by Low- and high-mass protostars propel jets outward perpendicular to a disk of material closely orbiting the star.
In stars with masses similar to the Sun, these jets are narrowed, or focused, relatively tightly near to the star in a process called collimation.
Because most high-mass protostars are more distant, studying the regions close to them has been more difficult, so astronomers were unclear if this was the case with them.
Cep A HW2 is expected to develop into a new star about 10 times more massive than the Sun.
The new VLA images of the system showed the finest detail yet seen in such an object, giving the astronomers their first view of the innermost portion of the jet, a portion roughly as long as the diameter of the Solar System.
Source
In stars with masses similar to the Sun, these jets are narrowed, or focused, relatively tightly near to the star in a process called collimation.
Because most high-mass protostars are more distant, studying the regions close to them has been more difficult, so astronomers were unclear if this was the case with them.
Cep A HW2 is expected to develop into a new star about 10 times more massive than the Sun.
The new VLA images of the system showed the finest detail yet seen in such an object, giving the astronomers their first view of the innermost portion of the jet, a portion roughly as long as the diameter of the Solar System.
Source
