Herbig-Haro Object


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Herbig-Haro object

[¦hər·big ′hä·rō ‚äb·jəkt]
(astronomy)
A bright patch on the surface of a dark cloud of gas and dust, consisting of light that has been scattered and reflected from a newborn star embedded in the cloud.

Herbig-Haro Object

 

a celestial object that is a small, irregularly shaped condensation of gas and dust and is associated with dark clouds of diffuse material in the Galaxy. Herbig-Haro objects are located in regions that are rich in T Tauri variable stars; they are known to be young formations. The objects were discovered by G. Herbig of the USA and G. Haro of Mexico between 1948 and 1952.

The angular sizes of Herbig-Haro objects usually lie in the range of 1”–10”, which corresponds to several thousand astronomical units. The spectra are subdivided into two types: (a) a weak continuous spectrum together with strong hydrogen emission lines and forbidden lines of oxygen, nitrogen, and sulfur; (b) a continuous spectrum of light from an illuminating star that is scattered by dust.

Herbig-Haro objects are believed to be the gas and dust envelopes of stars that are forming by the condensation of diffuse matter. The intensity of the radiation from the objects fluctuates. The differences in the types of spectra are probably attributable to different stages in the evolution of the objects.

REFERENCE

Eruptivnye zvezdy. Moscow, 1970. Pages 287–89.

B. V. KUKARKIN

References in periodicals archive ?
Gyulbudaghian's Nebula (GM 1-29) is illuminated by PV Cephei, a Herbig-Haro object (a newly born star that exhibits jets) cataloged as HH 215.
In another sighting by NASA that has wider entertainment implications in our mortal world, the Hubble telescope also captured a magnificent image of an object from outer space, termed as the Herbig-Haro object, codenamed HH24.
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Our final target is, strangely enough, bright--a glowing nebulosity associated with star formation and known as a Herbig-Haro object.
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Herbig-Haro objects are patches of material that are associated with baby stars, and that is where this protostar gets its name.
The bursts of gas have shaped the turbulent surroundings into sneeze-like structures known as Herbig-Haro objects.
de Witt was registered for a PhD on shock-excited masers in Herbig-Haro objects under the supervision of Smits and had a student assistantship post.