There are many peculiar nebulous objects associated with newly forming stars. Herbig - Haro (HH) objects are one of them.
Some of their features, astronomers understand perfectly, some others they cannot explain yet.
Herbig-Haro objects are usually between 500 and 4,000 AU in size and have masses in the range 0.5-30 Earth masses.
Their velocity is very high. They are among the least massive objects to have been detected outside our solar system.
They are named after the American astronomer George Herbig (1920–) and Guillermo Haro (1913 – 1988), Mexico's famous astronomer of the 20th Century.
What is the cause of the large arc and jets of gas clearly seen on the upper left of this image?
It’s looks like a waterfall… but it is nothing like that.
Jets are an active, short-lived phase of star formation, lasting only about 100,000 years.
The technical name for the stellar jets are Herbig-Haro (HH) objects.
They were named in honor of George Herbig and Guillermo Haro, who studied the outflows in the 1950s.
Arcs and jets in a Herbig-Haro 34, located about 1500 light-years away in constellation Orion
At the core of Herbig-Haro 34 lies a seemingly typical young star. This star, though, somehow ejects energetic "bullets" of high-energy particles,
appearing as red streaks toward the lower right of the this image. Astronomers speculate that a burst of these particles
might rebound when gas from a disk surrounding the star momentarily collapses onto the star. Visible near the end of each light-year long jet is a glowing cap. Credit: VLT Kueyen/FORS2, 8.2-meter VLT, ESO
Jets are an active, short-lived phase of star formation, lasting only about 100,000 years. The technical name for the stellar jets are Herbig-Haro
(HH) objects. They were named in honor of George Herbig and Guillermo Haro, who studied the outflows in the 1950s.
Astronomers don't know what role jets play in the star-formation process or exactly how the star unleashes them. The subject is an ongoing
topic of research, but it likely involves an accretion disk swirling around a central star.
The jets from young stars can be traced outward for a distance of several tenths of a parsec
Credit: NASA, ESA, and P. Hartigan (Rice University)
"For the first time we can actually observe how these jets interact with their surroundings by watching these time-lapse movies,"
said Patrick Hartigan, astronomer of Rice University in Houston, Texas. He has collected enough high-resolution Hubble images over
a 14-year period to stitch together time-lapse movies of young jets ejected from three stars.
"Those interactions tell us how young stars influence the environments out of which they form. With movies like these, we can now
compare observations of jets with those produced by computer simulations and laboratory experiments to see what aspects of the interactions
we understand and what parts we don't understand."
The Hubble Space Telescope has helped to shed some light on mysterious Herbig-Haro objects produced when the jet strikes and heats
clumps of interstelllar material.
According to astronomers, the jets of glowing gas travelling at supersonic speeds seem to point along the polar axis of the star,
but the phenomenon is still not definitely explained. And how the young stars create such jets?
In some cases, the jets can be traced outward for several tenths of a parsec! This cosmic event can be observed because the Herbig -
Haro objects, which are about as bright and luminous as the Sun, make this tracing possible.
Herbig-Haro Object Animation
This artist's concept of a Herbig-Haro object shows a jet coming from a young star.
Images taken over two decades with the NASA/ESA Hubble Space Telescope have captured the motion of these jets,
showing the matter moving over time. This artist's impression shows how the stellar outflows might look over a period of many centuries. Credit: ESA/Hubble (M. Kornmesser)
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