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{{Short description|Star in the constellation Crux}}
{{Starbox begin | name=λ Crucis}}
{{Starbox image
| image
}}
{{Starbox observe
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{{Starbox character
| type = [[main sequence]]
| class = B4 Vne<ref name=Levenhagen2006/>
| b-v =
| u-b =
| variable = [[Beta Cephei variable|β Cep]]?<ref name=Samus2017/>
}}
{{Starbox astrometry
| radial_v = {{Val|+12.0|4.2}}<ref name=rgcrv66/>
| prop_mo_ra =
| prop_mo_dec =
| parallax = 8.50
| p_error = 0.21
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v =
}}
{{Starbox detail
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}}
{{Starbox catalog
| names = {{odlist | V=
}}
{{Starbox reference
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{{Starbox end}}
'''λ Crucis''', [[Romanization of Greek|Latinized]] as '''Lambda Crucis''', is a single,<ref name=Rizzuto2013/> [[variable star]] in the southern [[constellation]] [[Crux]], near the constellation border with [[Centaurus]]. It is visible to the naked eye as a faint, blue-white hued point of light with an [[apparent visual magnitude]] that fluctuates around 4.62.<ref name=Samus2017/> The star is located approximately 384 [[light-year]]s distant from the [[Sun]] based on [[Stellar parallax|parallax]], and is drifting further away with a [[radial velocity]] of +12 km/s.<ref name=rgcrv66/> It is a [[proper motion]] member of the Lower
[[
the nearest such association of co-moving massive stars to the Sun.<ref name=aaa216_1_44/>
[[File:LambdaCruLightCurve.png|thumb|left|A [[light curve]] for Lambda Crucis, plotted from ''[[Hipparcos]]'' data<ref name=HIPCurve/>]]
λ Crucis is listed in the [[General Catalogue of Variable Stars]] as a possible [[Beta Cephei variable|β Cephei-type]] [[variable star|variable]]. Its brightness varies with an amplitude of 0<sup>m</sup>.02 over a period of 0.3951 days.<ref name=Samus2017/> However, it is currently thought more likely to be a different type of variable,<ref name=stankov/> possibly a [[λ Eridani variable]] or [[rotating ellipsoidal variable]].<ref name=balona/><ref name=morris/>
This object is a [[B-type main-sequence star]] with a [[stellar classification]] of B4 Vne,<ref name=Levenhagen2006/> where the suffix notation indicates "nebulous" (broad) [[absorption line|lines]] due to rapid rotation, along with [[emission lines]] from circumstellar material, making it a [[Be star]].<ref name=balona/> It is around 53<ref name=mnras410_1_190/> million years old and is spinning rapidly with a [[projected rotational velocity]] of 341 km/s.<ref name=uesugi_fukuda70/> The star has five<ref name=mnras410_1_190/> times the [[mass of the Sun]] and about 3.0<ref name=arcos/> times the [[Sun's radius]]. It is radiating 790<ref name=aaa216_1_44/> times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of {{val|16,500|ul=K|fmt=commas}}.<ref name=arcos/>
{{clear left}}
==References==
{{reflist|refs=
<ref name=HIPCurve>{{cite web
| title=Light Curve |url=https://www.cosmos.esa.int/web/hipparcos/java-tools/light-curve
| website=Hipparcos ESA |publisher=ESA |access-date=18 August 2022}}</ref>
<ref name=SIMBAD>{{cite simbad
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| doi=10.1111/j.1365-2966.2010.17434.x | s2cid=118629873 }}</ref>
<ref name=Rizzuto2013>{{
| title=Long-baseline interferometric multiplicity survey of the Sco-Cen OB association
| display-authors=1 | last1=Rizzuto | first1=A. C.
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| arxiv=1309.3811 }}</ref>
<ref name=arcos>{{
<ref name=stankov>{{
<ref name=balona>{{
<ref name=morris>{{
}}
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[[Category:Lower Centaurus Crux]]
<!-- Identifiers -->
[[Category:Crux
[[Category:Bayer objects|Crucis, Lambda]]
[[Category:Durchmusterung objects]]
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[[Category:Hipparcos objects|063007]]
[[Category:Bright Star Catalogue objects|4897]]
[[Category:Be stars]]
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