Concept information
Preferred term
Herbig-Haro object
Definition
- A Herbig-Haro object is a small bright nebula in a star-forming region, created when fast-moving (about 150 km/s) jets of material from an infant star collide with the interstellar medium. 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 the cooling gas behind the shock front, electrons and ions recombine to give an emission line spectrum characteristic of Herbig-Haro objects. They are named after the American astronomer George Herbig (1920–2013) and Guillermo Haro who discovered the first three such objects in 1946–1947 in images of the nebula NGC 1999 in Orion. All known Herbig-Haro objects have been found within the boundaries of dark clouds and are strong sources of infrared. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/H/Herbig-Haro_object.html)
Broader concept
Entry terms
- HH object
In other languages
-
French
-
nébulosité Herbig-Haro
-
objet de Herbig-Haro
-
objet HH
URI
http://data.loterre.fr/ark:/67375/MDL-S13QZ7LP-4
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