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 It might be outdated or ideologically biased.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.
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