Lambda Crucis

Lambda Crucis
Diagram showing star positions and boundaries of the Crux constellation and its surroundings


Location of λ Crucis (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 54m 39.1821s[1]
Declination −59° 08′ 48.124″[1]
Apparent magnitude (V) 4.602[2]
Characteristics
Spectral type B4 Vne[2]
U−B color index –0.60[3]
B−V color index –0.15[3]
Variable type Beta Cephei[4]
Astrometry
Radial velocity (Rv)12[5] km/s
Proper motion (μ) RA: –33.35[1] mas/yr
Dec.: –14.75[1] mas/yr
Parallax (π)9.06 ± 0.60[1] mas
Distance360 ± 20 ly
(110 ± 7 pc)
Absolute magnitude (MV)–1.2[6]
Details
Mass5.0 ± 0.1[7] M☉
Luminosity790[6] L☉
Surface gravity (log g)4.00[6] cgs
Temperature15,800[6] K
Rotational velocity (v sin i)341[8] km/s
Age53.3 ± 8.1[7] Myr
Other designations
HR 4897, CD-58 4794, HD 112078, SAO 240368, HIP 63007.[2]

Lambda Crucis (λ Crucis / λ Cru) is a star in the southern constellation Crux. The star is classified as a blue-white dwarf (spectral class B4 Vn). The apparent magnitude of λ Crucis is 4.6, but it is not stable. The star is a β Cephei-type variable, and its brightness varies with an amplitude of 0.02m period being 0.3951 days.[4] λ Crucis is located at 360 light-years from the Sun.

This star 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]

References

  1. 1 2 3 4 5 Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
  2. 1 2 3 "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2007-01-04.
  3. 1 2 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
  4. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2004). "Combined General Catalogue of Variable Stars (GCVS4.2)". Retrieved 2007-01-04.
  5. ↑ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Retrieved 2009-09-10.
  6. 1 2 3 4 5 de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1-2): 44–61, Bibcode:1989A&A...216...44D
  7. 1 2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883Freely accessible, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
  8. ↑ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. University of Kyoto. Bibcode:1970crvs.book.....U.


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