Bok Globule
In 1947, Bart Bok suggested that the small dark globules of interstellar gas and dust were undergoing collapse on their way to forming new stars. In recent years, a great deal of evidence supporting this proposal has been found.
Bok Globules
Small, dark clouds only about 1 light year in diameter that contain 10-1000 solar masses of gas and dust. Believed to be related to star formation.
Bow Shock ...
Bok globule: Small, dark cloud only about 1 ly in diameter that contains 10 to 1000 solar masses of gas and dust; believed to be related to star formation.
Bok Globule
A compact, spherical dark nebula. Bok globules have characteristic radii of 103-105 AU. Estimates of their mass suggest that their density is too low for gravitational collapse.
Bok globule
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Bok globules in H II region IC 2944.
The actual birth of stars within H II regions is hidden from us by the dense clouds of gas and dust which surround the nascent stars.
The Bok globules in NGC 281 are located very close to the center of the IC 1590 cluster. The exquisite resolution of these Hubble observations shows the jagged structure of the dust clouds as if they are being stripped apart from the outside.
Main article: Bok globule
Isolated gravitationally bound small molecular clouds with masses less than a few hundred times the mass of the sun are called Bok globules.
Found that some Bok globules contain protostars
Cataloged thousands of hot, dense cores within clouds of gas and dust which could be newly forming stars
Cataloged over 12,000 variable stars, the largest collection known to date ...
Recent observations at radio wavelengths of a gas cloud known as Bok Globule B335 have produced images of material collapsing onto a newly born star (only about 150,000 years old).
As the cloud collapses, individual conglomerations of dense dust and gas form what are known as Bok globules. These can contain up to 50 solar masses of material.
Bok globules have characteristic radii of 103-105 AU. Estimates of their mass suggest that their density is too low for gravitational collapse. They tend to lie in regions of much dust but less gas than would be expected for star-forming regions.
Dark dusk clouds like these ``Bok globules'' in IC 2948 were once thought to be holes in the sky. The dark clouds block the light from the emission nebula behind.
Bart Jan Bok
1906-1983
Dutch
suggested that small dark globules of interstellar gas and dusk (now called Bok globules) are collapsing to form new stars ...
UKS 38 Proxima Centaurii, the nearest star
AAT 95 NGC 6164-5, a nebula around a hot star in Norma
AAT 27 The annulus of Shapley 1, a planetary nebula
AAT 77 Bok globules in the IC 2944/48 nebula in Centaurus ...
Large dark nebulae that can contain over a million solar masses of material and extend over 200 parsecs are known as giant molecular clouds. The smallest ones, called Bok globules, ...
toward the center, providing the protostar with heat and a weak infra-red glow -- heat is defined as particle motion -- and rotation (think of an ice skater pulling in her arms as she goes into a spin). (Protostars can be detected in Bok Globules.) ...
 See also: Globule, Dust, Nebula, Star, Light
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