#herbig-haro

[spacewonder19]

HH 24: Star-birth Fireworks © Gemini Observatory

[blasteffect]

Awakening Newborn Stars !

Lying inside our home galaxy, the Milky Way, this Herbig–Haro object is a turbulent birthing ground for new stars in a region known as the Orion B molecular cloud complex, located 1,350 light-years away.

Herbig–Haro (HH) objects are bright patches of nebulosity associated with newborn stars that form when narrow jets of partially ionized gas ejected by stars collide with nearby clouds of gas and dust. 

When stars form within giant clouds of cool molecular hydrogen, some of the surrounding material collapses under gravity to form a rotating, flattened disk encircling the newborn star.

Although planets will later congeal in the disk, at this early stage the protostar is feeding on the disk with a voracious appetite. Gas from the disk rains down onto the protostar and engorges it. Superheated material spills away and is shot outward from the star in opposite directions along an uncluttered escape route – the star's rotation axis.

Shock fronts develop along the jets and heat the surrounding gas to thousands of degrees Fahrenheit. The jets collide with the surrounding gas and dust and clear vast spaces, like a stream of water plowing into a hill of sand.

Image Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)/Hubble-Europe (ESA) Collaboration, D. Padgett (GSFC), T. Megeath (University of Toledo), and B. Reipurth (University of Hawaii)

[spinningblueball]

Sharpless (Sh) 155 Cave Nebula (upper left), Lynds Dark Nebula (LDN) 1210 (lower right), & Herbig-Haro (H-H) 168 (below Sh-155)

[spacewonder19]

Young stars in Orion Nebula © Hubble

[spacewonder19]

Colorful region surrounding HH 505, a Herbig-Haro object 

[spacewonder19]

Young star punching through dust cloud with a gas jet 

[caelora]

Getti, da una stella in formazione

Dalla ricerca (immaginata) in autobus, ad uno degli interrogativi importanti dello studio delle stelle in formazione. Con una immagine fantastica (letteralmente) e una reale ed ancora più bella!

Vado subito al dunque: quando una stella si forma, origina sempre dei getti di materia? Tutti ce lo siamo chiesti molto spesso, a volte con un’ansia di trovare la risposta, che non ci permette alcuna tregua. Lo so, sono domande che indubbiamente ci assillano: vedo in metropolitana, sul tram, tutte queste persone impegnate a fare calcoli, discutere teorie, immaginare scenari, litigare sulle…

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[spacetelescopescience]

This unique display within our Milky Way galaxy is the site of a growing young star. The center of the image shows a star, shrouded in dust, shooting out two jets into space. These jets form as gas and dust that surrounds the star nears it, becomes hot and gets spat out in opposite directions. The jets strike the matter around it, heating it and forming glowing patches called Herbig-Haro (HH) objects. The prominent one in this picture is called HH 24. 

Its name is based on two scientists, George Herbig and Guillermo Haro, who each discovered nebulas with areas as bright as stars. Further study, however, showed that these bright areas were not stars, but highly ionized environments. Eventually, Herbig-Haro objects were discovered to occur near young stars.

Credit: NASA & ESA; the Hubble Heritage (STScI/AURA)/Hubble-Europe (ESA) Collaboration, D. Padgett (GSFC), T. Megeath (University of Toledo), and B. Reipurth (University of Hawaii).