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 ?
When this material crashes into the surrounding gas it glows, creating a Herbig-Haro object [1].
The peculiar scimitar-shaped bright feature at the upper left is probably mostly due to starlight being reflected from dust and is not a Herbig-Haro object.
These shocks cause the gas to shine and create the strangely coloured glowing arcs and blobs known as Herbig-Haro objects.
NcNeil's nebula, which is associated with a Herbig-Haro object (a young star), is now difficult to locate, but further observations of the area would be useful in case this object flares again.
Other objects were highlighted that show startling areas of dust, for example the Sombrero Galaxy (M104) in Virgo, the Eagle Nebula (M16) in Sagittarius, the colliding Antennae galaxies and Herbig-Haro object 46/47.
The bursts of gas have shaped the turbulent surroundings into sneeze-like structures known as Herbig-Haro objects.
V633 Cassiopeia has the two Herbig-Haro objects HH 161 and HH 164 forming parts
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.
Smits and de Witt continued with their work on looking for shock-excited 1720 MHz OH masers towards Herbig-Haro objects.
Astronomers have viewed with greater clarity than ever before a dust-cloaked region of starbirth in the Milky Way, The violent interactions they recorded there may shed new light on luminous knots of gas, known as Herbig-Haro objects, whose origin has been controversial ever since they were discovered in the late 1940s.
Evidence for such stellar precursors comes from nebulae termed Herbig-Haro objects, named after George Herbig and Guillermo Haro, who first studied them, albeit individually.
de Witt is registered for a PhD on shock-excited masers in Herbig-Haro objects under the supervision of Smits.