Lambda Crucis

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Template:Short description

λ Crucis
Template:Location mark
Location of λ Crucis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.62[2]
Characteristics
Evolutionary stage main sequence
Spectral type B4 Vne[3]
U−B Template:Engvar −0.60[4]
B−V Template:Engvar −0.15[4]
Variable type β Cep?[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: −32.92[1] mas/yr
Dec.: −14.60[1] mas/yr
Parallax (π)8.50±0.21 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.2[6]
Details
MassScript error: No such module "val".[7] Template:Solar mass
Radius3.00[8] Template:Solar radius
Luminosity790[6] Template:Solar luminosity
Surface gravity (log g)3.01[8] cgs
Temperature16,500[8] K
Rotational velocity (v sin i)290[8] km/s
AgeScript error: No such module "val".[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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λ Crucis, Latinized as Lambda Crucis, is a single,[10] 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.[2] The star is located approximately 384 light-years distant from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s.[5] It is a proper motion member of the Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[6]

File:LambdaCruLightCurve.png
A light curve for Lambda Crucis, plotted from Hipparcos data[11]

λ Crucis is listed in the General Catalogue of Variable Stars as a possible β Cephei-type variable. Its brightness varies with an amplitude of 0m.02 over a period of 0.3951 days.[2] However, it is currently thought more likely to be a different type of variable,[12] possibly a λ Eridani variable or rotating ellipsoidal variable.[13][14]

This object is a B-type main-sequence star with a stellar classification of B4 Vne,[3] where the suffix notation indicates "nebulous" (broad) lines due to rapid rotation, along with emission lines from circumstellar material, making it a Be star.[13] It is around 53[7] million years old and is spinning rapidly with a projected rotational velocity of 341 km/s.[15] The star has five[7] times the mass of the Sun and about 3.0[8] times the Sun's radius. It is radiating 790[6] times the luminosity of the Sun from its photosphere at an effective temperature of Script error: No such module "val"..[8]

References

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  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b c d Script error: No such module "Citation/CS1".
  7. ↑ a b c d Script error: No such module "Citation/CS1".
  8. ↑ a b c d e f Script error: No such module "Citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Crux

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