Editing Crux (section)

===Variable stars===

Crux contains many [[variable star]]s. It boasts four [[Cepheid variable]]s that may all reach naked eye visibility.
* [[BG Crucis]] ranges from magnitude 5.34 to 5.58 over 3.3428 days,<ref name=AAVSOBG>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10853 |title=BG Crucis |last=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=12 March 2014}}</ref>
* [[T Crucis]] ranges from 6.32 to 6.83 over 6.73331 days,<ref name=AAVSOT>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10771 |title=T Crucis |last=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=12 March 2014}}</ref>
* [[S Crucis]] ranges from 6.22 to 6.92 over 4.68997 days,<ref name=AAVSOS>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10770 |title=S Crucis |last=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=12 March 2014}}</ref>
* [[R Crucis]] ranges from 6.4 to 7.23 over 5.82575 days.<ref name=AAVSOR>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10769 |title=R Crucis |last=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=12 March 2014}}</ref>

Other well studied variable stars includes:
* [[Lambda Crucis]] and [[Theta2 Crucis|Theta<sup>2</sup> Crucis]], that are both Beta Cepheid type variable stars.<ref name=bagnall/>
* [[BH Crucis]], also known as Welch's Red Variable, is a [[Mira variable]] that ranges from magnitude 6.6 to 9.8 over 530 days.<ref name=AAVSOBH>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10854 |title=BH Crucis |last=Otero, Sebastian |date=6 January 2011 |work=AAVSO Website|publisher=American Association of Variable Star Observers|access-date=23 June 2014}}</ref>  Discovered in October 1969, it has become redder and brighter (mean magnitude changing from 8.047 to 7.762) and its period lengthened by 25% in the first thirty years since its discovery.<ref name=walker09>{{cite journal | bibcode=2009JAVSO..37...87W   | journal = J. Am. Assoc. Variable Star Obs. |volume= 37| issue = 2 |pages= 87–95 |year=2009|title= BH Crucis : Period, Magnitude, and Color Changes |author= Walker, W.S.G.}}</ref>