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CH Crucis - Wikipedia

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CH Crucis
Observation data Epoch J2000 Equinox J2000
A blue band light curve for CH Crucis, plotted from data published by Balona et al. (1992)^[1]
Constellation	Crux
Right ascension	12^h 41^m 56.56824^s^[2]
Declination	−59° 41′ 08.9564″^[2]
Apparent magnitude (V)	4.91^[3]
Characteristics
Spectral type	B5III^[4] or B6IV^[5]
U−B color index	−0.37^[6]
B−V color index	−0.044±0.03^[3]
Variable type	γ Cas?^[7]
Astrometry

Radial velocity (R_v)	+12.5±2.8^[3] km/s
Proper motion (μ)	RA: -23.987^[2] mas/yr Dec.: -4.110^[2] mas/yr
Parallax (π)	4.2068 ± 0.1651 mas^[2]
Distance	780 ± 30 ly (238 ± 9 pc)
Absolute magnitude (M_V)	−2.41^[3]

Details

Mass	5.30±0.27^[8] `M`_☉
Radius	11.20±0.22^[9] `R`_☉
Luminosity	1,073^[3] `L`_☉
Surface gravity (log g)	2.90±0.03^[9] cgs
Temperature	10,600±106^[9] K
Rotational velocity (v sin i)	240^[10] km/s
Age	120^[11]^{[better source needed]} Myr

Other designations
CH Cru, CPD−59° 4393, HD 110335, HIP 61966, HR 4823, SAO 240161, G 39 Crucis^[12]^[13]
Database references
SIMBAD	data

CH Crucis is a solitary^[14] variable star in the southern constellation of Crux. It has the Gould designation 39 G. Crucis.^[12] 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.^[3] The star is located approximately 780 light years distant from the Sun based on parallax,^[2] and is drifting further away with a radial velocity of about +12.5 km/s.^[3] It is a member of the nearby Sco OB2 association.^[15]

This is a conventional shell star, which is understood to be a Be star that is being viewed edge-on.^[16] Houk (1975) found a stellar classification of B5III,^[4] while Hiltner et al. assigned it to B6IV;^[5] suggesting it is a B-type star that is evolving off the main sequence.^[8] 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.^[7]

CH Crucis has 5.3^[8] times the mass of the Sun and 11.2^[9] times the Sun's radius. It is radiating 1,073^[3] times the luminosity of the Sun from its photosphere at an effective temperature of 10,600 K.^[9] It is spinning rapidly with estimates of the projected rotational velocity ranging up to 240 or 250 km/s.^[16]^[10] This is giving the star an oblate shape with an equatorial bulge that is an estimated 18% larger than the polar radius.^[10]

References

^ 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. Retrieved 18 December 2021.
^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
^ ^a ^b Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
^ "39 Crucis, a blue subgiant star in Crux", Ashland Astronomy Studio, archived from the original on 2013-04-14, retrieved 2012-08-23
^ ^a ^b 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, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
^ ^a ^b ^c Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b ^c ^d ^e 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, arXiv:1711.08675, Bibcode:2018MNRAS.474.5287A, doi:10.1093/mnras/stx3075, S2CID 74872624.
^ ^a ^b ^c Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
^ "HIP 61966", Wolfram Alpha, retrieved 2012-08-23
^ ^a ^b Gould, Benjamin Apthorp (1879), "Uranometria Argentina catalog of bright southern stars", Resultados del Observatorio Nacional Argentino, 1, Bibcode:1879RNAO....1.....G, retrieved 2012-05-08.
^ "CH Cru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-15.
^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Hoogerwerf, Ronnie (March 2000), "OB association members in the ACT and TRC catalogues", Monthly Notices of the Royal Astronomical Society, 313 (1): 43–65, Bibcode:2000MNRAS.313...43H, doi:10.1046/j.1365-8711.2000.03192.x.
^ ^a ^b Rivinius, Th.; et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics, 459 (1): 137–145, Bibcode:2006A&A...459..137R, doi:10.1051/0004-6361:20053008.

Constellation of Crux

Stars

Bayer	α (Acrux) β (Mimosa) γ (Gacrux) δ (Imai) ε (Ginan) ζ η θ¹ θ² ι λ μ¹ μ²
Variable	R S T V W X BG BH BL BP BU BZ CD CH DL DS DU
HR	4729 4848 4887 4890
HD	106906 108147 (Tupã)
Other	NGC 4349-127 PSR B1259−63/LS 2883 WR 46

Exoplanets	HD 106906 b HD 108147 b

Star clusters	Dragonfish Nebula Jewel Box (κ) NGC 4103 NGC 4349 NGC 4609

Nebulae	Coalsack Nebula Dragonfish Nebula IRAS 12063-6259