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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Back in 2012, the Hubble also managed to capture another Herbig-Haro object, the HH 110.
This hourglass-shaped Herbig-Haro object signals the recent birth of a new star at its center.
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.
Baldwin, "A photoionized Herbig-Haro object in the Orion Nebula," Astrophysical Journal Letters, vol.
When this material crashes into the surrounding gas it glows, creating a Herbig-Haro object [1].
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.
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 this section we apply the results of the data reduction and calibration process to a particular scientific case: the study of the Herbig-Haro object HH202 in the Orion nebula (see Figure 9).
This pair of images show a close-up of Herbig-Haro Object 555 (circled) in the Pelican Nebula.
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.
Our final target is, strangely enough, bright--a glowing nebulosity associated with star formation and known as a Herbig-Haro object. HH objects are formed when shockwaves created by material ejected by a new star plow into surrounding nebulosity; the interaction causes the light of hydrogen atoms and sulfur ions to glow.
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.