Bokovy globule: Porovnání verzí

'''Bokovy globule''' jsou hustá oblaka [[Kosmický prach|kosmického prachu]] a plynu, ve kterých se někdy formují hvězdy. Byly nalezeny v [[HII oblast|oblastech H II]] a obvykle mají hmotnost mezi 2<ref>{{cite web |author=Michael Szpir |title=Bart Bok's Black Blobs |url=http://www.americanscientist.org/template/AssetDetail/assetid/14678 |date=May–June 2001 |archiveurl=http://web.archive.org/web/20030629033609/http://www.americanscientist.org/template/AssetDetail/assetid/14678 |archivedate=2003-06-29 |publisher=[[American Scientist]] |quote=Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses |accessdate=2008-11-19}}</ref> až 50 [[Sluneční hmotnost|Sluncí]] a zhruba jeden [[světelný rok]] v průměru.<ref name="clemens91">{{Citation | last = Clemens | first = Dan P. | last2 = Yun | first2 = Joao Lin | last3 = Meyer | first3 = Mark H. | title = BOK globules and small molecular clouds – Deep IRAS photometry and (C-12)O spectroscopy | journal = Astrophysical Journal Supplement | volume = 75 | pages = 877 | year = 1991 | month = March | url = http://adsabs.harvard.edu/abs/1991ApJS...75..877C|bibcode = 1991ApJS...75..877C |doi = 10.1086/191552}}</ref> Obsahují molekulární [[vodík]] (H₂), oxidy [[uhlík]]u a [[helium]], okolo 1 % hmotnosti tvoří křemičitany ve formě prachu. Bokovy globule se nejčastěji tvoří ve formujících se v [[Dvojhvězda|dvou-]] a [[Trojhvězda|vícehvězdných]] systémech.<ref>{{Cite conference | first = R. | last = Launhardt | coauthors = A.I. Sargent, T. Henning, et al. | title = Binary and multiple star formation in Bok globules | booktitle = Birth and Evolution of Binary Stars, Poster Proceedings of IAU Symposium No. 200 on The Formation of Binary Stars | pages = 103 | publisher = Bo Reipurth and Hans Zinnecker | date = 10–15 April 2000 | location = Potsdam, Germany | url = http://adsabs.harvard.edu/abs/2000IAUS..200P.103L | accessdate = 2010-03-29}}</ref>