Hubble Looks at Newly Forming Stars in a Stellar Nursery - by spacewriter
In the case of HH 1 and 2, two groups of astronomers requested Hubble observations for two different studies. The first delved into the structure and motion of the Herbig-Haro objects HST studied. That’s giving astronomers a better understanding of physical processes at work when outflows from a stellar nursery collide with surrounding gas and dust. The second study investigated the outflows themselves.
Astronomers George Herbig and Guillermo Haro studied these glowing clouds in the late 1940s as part of research into stellar nurseries. Today, after observations of other similar HH objects, astronomers understand them as shock-induced phenomena driven by jets from nearby protostars. There are more than a thousand known individual HH objects, and they’re usually found near Bok globules. These are cold, thick clouds where protostars begin their journey to full star status.
Another example of jets illuminating a stellar nursery. This is Herbig-Haro object HH 24 as seen by Hubble Space Telescope. Courtesy NASA/ESA/STScI. What we’re really seeing in an HH object is a snapshot in time during the life of a star. Most of the newborn stars that emit jets could be anywhere from tens of thousands of years to just under a million years old. They’ve started nuclear fusion, but are still collecting gas and dust during accretion. Their jets move out at very high speeds and collide with clumps of gas and dust, causing them to glow.
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