Astronomy:CH Crucis

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Short description: Star in the constellation Crux
CH Crucis
Location of CH Crucis (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Crux
Right ascension  12h 41m 56.56824s[1]
Declination −59° 41′ 08.9564″[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Spectral type B5III[3] or B6IV[4]
U−B color index −0.37[5]
B−V color index −0.044±0.03[2]
Variable type γ Cas?[6]
Astrometry
Radial velocity (Rv)+12.5±2.8[2] km/s
Proper motion (μ) RA: -23.987[1] mas/yr
Dec.: -4.110[1] mas/yr
Parallax (π)4.2068 ± 0.1651[1] mas
Distance780 ± 30 ly
(238 ± 9 pc)
Absolute magnitude (MV)−2.41[2]
Details
Mass5.30±0.27[7] M☉
Radius11.20±0.22[8] R☉
Luminosity1,073[2] L☉
Surface gravity (log g)2.90±0.03[8] cgs
Temperature10,600±106[8] K
Rotational velocity (v sin i)240[9] km/s
Age120[10] Myr
Other designations
Lumbung, CH Cru, CPD−59°4393, HD 110335, HIP 61966, HR 4823, SAO 240161[11]
Database references
SIMBADdata

CH Crucis (39 Crucis), also named Lumbung,[12] is a solitary[13] variable star in the southern constellation of Crux. It has the Gould designation 39 G. Crucis.[14] The object is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude that fluctuates around 4.91.[2] The star is located approximately 780 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of about +12.5 km/s.[2] It is a member of the nearby Sco OB2 association.[15]

A blue band light curve for CH Crucis, plotted from data published by Balona et al. (1992)[16]

This is a conventional shell star, which is understood to be a Be star that is being viewed edge-on.[17] Houk (1975) found a stellar classification of B5III,[3] while Hiltner et al. assigned it to B6IV;[4] suggesting it is a B-type star that is evolving off the main sequence.[7] Samus et al. (2017) have tentatively classified it as a Gamma Cassiopeiae variable that ranges in brightness from magnitude 4.88 down to 5.7.[6]

CH Crucis has 5.3[7] times the mass of the Sun and 11.2[8] times the Sun's radius. It is radiating 1,073[2] times the luminosity of the Sun from its photosphere at an effective temperature of 10,600 K.[8] It is spinning rapidly with estimates of the projected rotational velocity ranging up to 240 or 250 km/s.[17][9] This is giving the star an oblate shape with an equatorial bulge that is an estimated 18% larger than the polar radius.[9]

The IAU Working Group on Star Names approved the name Lumbung for this star on 22 February 2026.[12] Lumbung is a constellation from Bali (Indonesia), corresponding to Crux. The term is inherited from Malay, Proto-Malayo-Polynesian, meaning a rice barn or granary. The constellation of Lumbung is attested for ~1300 years in the cultural calendar and associated with Wednesday and the third day of an Oceanic market cycle.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal 157: 313–326, doi:10.1086/150069, Bibcode: 1969ApJ...157..313H. 
  5. ↑ "39 Crucis, a blue subgiant star in Crux", Ashland Astronomy Studio, http://www.astrostudio.org/xhip.php?hip=61966, retrieved 2012-08-23 
  6. ↑ 6.0 6.1 Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  7. ↑ 7.0 7.1 7.2 Zorec, J. et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Arcos, C. et al. (March 2018), "Stellar parameters and H α line profile variability of Be stars in the BeSOS survey", Monthly Notices of the Royal Astronomical Society 474 (4): 5287–5299, doi:10.1093/mnras/stx3075, Bibcode: 2018MNRAS.474.5287A. 
  9. ↑ 9.0 9.1 9.2 Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V. 
  10. ↑ "HIP 61966", Wolfram Alpha, http://www.wolframalpha.com/input/?i=HIP+61966, retrieved 2012-08-23 
  11. ↑ "CH Cru". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CH+Cru. 
  12. ↑ 12.0 12.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Gould, Benjamin Apthorp (1879), "Uranometria Argentina catalog of bright southern stars", Resultados del Observatorio Nacional Argentino 1, Bibcode: 1879RNAO....1.....G, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=V%2F135%2Fcatalog, retrieved 2012-05-08. 
  15. ↑ Hoogerwerf, Ronnie (March 2000), "OB association members in the ACT and TRC catalogues", Monthly Notices of the Royal Astronomical Society 313 (1): 43–65, doi:10.1046/j.1365-8711.2000.03192.x, Bibcode: 2000MNRAS.313...43H. 
  16. ↑ Balona, L. A.; Cuypers, J.; Marang, F. (February 1992). "Intensive photometry of southern Be variables. II. Summer objects". Astronomy & Astrophysics Supplement Series 92: 533–563. Bibcode: 1992A&AS...92..533B. https://ui.adsabs.harvard.edu/abs/1992A&AS...92..533B. Retrieved 18 December 2021. 
  17. ↑ 17.0 17.1 Rivinius, Th. et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics 459 (1): 137–145, doi:10.1051/0004-6361:20053008, Bibcode: 2006A&A...459..137R. 
  18. ↑ "Lumbung". IAU Working Group on Star Names. https://ase.exopla.net/index.php/Lumbung. 



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