What is Albireo?
{{more sources|date=January 2019}} [[File:NewAlbireo.jpg|thumb|right|Albireo A and B.]]'''Albireo''', also called '''Beta Cygni''', is a [[binary star]] found in the [[Cygnus (constellation)|Cygnus constellation]]. It consists of two stars, a red giant called '''Albireo Aa''' and a blue main sequence star named '''Albireo Ac.'''<ref>{{Cite journal|url=https://doi.org/10.1086%2F342942|doi = 10.1086/342942|title = Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components|year = 2002|last1 = Ginestet|first1 = N.|last2 = Carquillat|first2 = J. M.|journal = The Astrophysical Journal Supplement Series|volume = 143|issue = 2|pages = 513–537|bibcode = 2002ApJS..143..513G| s2cid=120976247 }}</ref> Another blue star named '''Albireo B''' could be part of the system. == References == {{reflist}} [[Category:Binary stars]] [[Category:Stars]] [[Category:Red giants]] {{physics-stub}} {{sci-stub}}