Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..26....2r&link_type=abstract
The Messenger, vol. 26, p. 2-4
Astronomy and Astrophysics
Astronomy
Globules:Star Formation
Scientific paper
Among the many dark clouds seen projected against the luminous band of the Milky Way are a number of small, isolated compact clouds, which often exhibit a large degree of regularity. These objects are today known as Bok globules, after the Dutch-American astronomer Bart Bok, who more than 30 years aga singled out the globules as a group of special interest among the dark clouds. Bok globules usually have angular sizes of from a few arcminutes to about 20 arcminutes, with real sizes of typically 0.15 to 0.8 parsecs. It is generally not so easy to estimate the distance, and thus the dimensions, of a given globule. Most known globules are closer than 500 pc, since they normally are found by their obscuring effects, and more distant globules become less conspicuous because of foreground stars. A nearby, compact Bok globule is indeed a spectacular sight; when William Herschel for the first time saw a globule in his telescape, he exclaimed: ' Mein Gott, da ist ein Loch im Himmel.'
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