Molecular hydrogen, carbon oxides, helium, and silicate dust
Size range
~1ly
External links
Media category
Q213936
Additional Information
Discovered
Bart Bok, 1940s
Star formation
Object classes
Interstellar medium
Molecular cloud
Bok globule
Dark nebula
Young stellar object
Protostar
Pre-main-sequence star
T Tauri star
Herbig Ae/Be star
Herbig–Haro object
Theoretical concepts
Accretion
Initial mass function
Jeans instability
Kelvin–Helmholtz mechanism
Nebular hypothesis
Planetary migration
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In astronomy, Bok globules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place. Bok globules are found within H II regions, and typically have a mass of about 2[1] to 50 solar masses contained within a region about a light year or so across (about 4.5×1047 m3).[2] They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust. Bok globules most commonly result in the formation of double- or multiple-star systems.[3]
^Michael Szpir (May–June 2001). "Bart Bok's Black Blobs". American Scientist. Archived from the original on 2017-04-24. Retrieved 2008-11-19. Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses
^Clemens, Dan P.; Yun, João Lin; Meyer, Mark H. (March 1991). "BOK globules and small molecular clouds – Deep IRAS photometry and (C-12)O spectroscopy". Astrophysical Journal Supplement. 75: 877. Bibcode:1991ApJS...75..877C. doi:10.1086/191552.
^Launhardt, R.; Sargent, A. I.; Henning, T.; Zylka, R.; Zinnecker, H. (10–15 April 2000). "Binary and multiple star formation in Bok globules". Birth and Evolution of Binary Stars, Poster Proceedings of IAU Symposium No. 200 on The Formation of Binary Stars. Potsdam, Germany: Bo Reipurth and Hans Zinnecker. p. 103. Bibcode:2000IAUS..200P.103L.
astronomy, Bokglobules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place. Bok globules...
Look up globule in Wiktionary, the free dictionary. Globule may refer to: Bokglobule, dark clouds of dense cosmic dust Drop (liquid), small column of...
with Giant Molecular Clouds. Isolated small dark nebulae are called Bokglobules. Like other interstellar dust or material, the things it obscures are...
(400 pc) from Earth. It is one of several objects referred to as "cometary globules", because its shape is similar to that of a comet. It has a dense head...
HOPS 383 (2015). Protostar in Herbig-Haro 46/47. A protostar inside a Bokglobule (Artist's image). Stellar cluster RCW 38, around the young star IRS2...
of Bokglobules, which are small, densely dark clouds of interstellar gas and dust that can be seen silhouetted against brighter backgrounds. Bok suggested...
Barnard 68 is a molecular cloud, dark absorption nebula or Bokglobule, towards the southern constellation Ophiuchus and well within the Milky Way galaxy...
with masses less than a few hundred times that of the Sun are called Bokglobules. The densest parts of small molecular clouds are equivalent to the molecular...
features Bokglobules, which are frequently a site of active star formation. However, no evidence for star formation has been found in any of the globules in...
the opaque clouds of dense gas and dust known as Bokglobules, so named after the astronomer Bart Bok. These can form in association with collapsing molecular...
ordinary Bokglobules, cometary globules are believed to be associated with star formation. A notable object inside one of these cometary globules is the...
northwest of the Carina Nebula (or to its embedded star cluster). A small Bokglobule in the Keyhole Nebula (at RA 10h 44m 30s, Dec −59° 40') has been photographed...
intermediate-mass YSOs, and brown dwarfs. Young stellar jet MHO 2147 Star portal Bokglobule Lada, Charles J. (1987). "Star Formation: From OB Associations to Protostars"...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
Star formation Object classes Interstellar medium Molecular cloud Bokglobule Dark nebula Young stellar object Protostar Pre-main-sequence star T Tauri...
that disk accreted into the giant planet's regular moons. Asteroid belt Bokglobule Comet Exocomet Formation and evolution of the Solar System Herbig–Haro...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
NGC 6520. Close by to the west is the small dark nebula Barnard 86, a Bokglobule described by Edward Emerson Barnard as “a drop of ink on the luminous...
v t e Stars List Formation Accretion Molecular cloud Bokglobule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri Herbig–Haro object...
Global Information
Media category
Q213936