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== Abundance == [[Binary stars#Research findings|Research on binary and multiple stars]] estimates they make up about a third of the star systems in the [[Milky Way]] galaxy, with two-thirds of stars being single.<ref>[https://pweb.cfa.harvard.edu/news/most-milky-way-stars-are-single Most Milky Way Stars Are Single], Harvard-Smithsonian Center for Astrophysics.</ref> Binary stars are the most common non-single stars. With multiple star systems, the number of known systems decreases exponentially with multiplicity.<ref name="tok1">{{cite journal |last1=Tokovinin |first1=A. |year=2001 |title=Statistics of multiple stars: Some clues to formation mechanisms |journal=The Formation of Binary Stars |volume=200 |page=84 |bibcode=2001IAUS..200...84T}}</ref> For example, in the 1999 revision of Tokovinin's catalog<ref name=toko>{{cite journal |last1=Tokovinin |first1=A.A. |year=1997 |title=MSC - a catalogue of physical multiple stars |journal=Astronomy and Astrophysics Supplement Series |volume=124 |page=75 |doi=10.1051/aas:1997181 |doi-access=free |bibcode=1997A&AS..124...75T}}<br /> online versions at <br />{{cite web |url=http://cdsweb.u-strasbg.fr/viz-bin/VizieR?-source=J/A%2bAS/124/75 |title=online version at VizieR |archive-url=https://web.archive.org/web/20070311101531/http://cdsweb.u-strasbg.fr/viz-bin/VizieR?-source=J%2FA%2BAS%2F124%2F75 |archive-date=11 March 2007}}<br /> and at <br />{{cite web |url=http://www.ctio.noao.edu/~atokovin/stars/ |title=Multiple star catalog |website=ctio.noao.edu |editor=A. Tokovin}}</ref> of physical multiple stars, 551 out of the 728 systems described are triple. However, because of suspected [[selection effect]]s, the ability to interpret these statistics is very limited.<ref>{{cite journal |last1=Tokovinin |first1=A. |year=2004 |title=Statistics of multiple stars |journal=Revista Mexicana de Astronomía y Astrofísica, Serie de Conferencias |volume=21 |page=7 |bibcode=2004RMxAC..21....7T}}</ref>
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