3 Centauri

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3 Centauri
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Centaurus
Right ascension 13h 51m 49.60s [1]
Declination −32° 59′ 38.7″ [1]
Apparent magnitude  (V)4.32 [2] (4.52 + 5.97) [3]
Characteristics
Spectral type B5 III-IVp [4] + B8 V [5]
B−V color index −0.146±0.003 [2]
Variable type Eclipsing? [6]
Astrometry
Radial velocity (Rv)+7.5±1.6 [7]  km/s
Absolute magnitude  (MV)−0.46 [2]
A
Proper motion (μ)RA: −34.698±0.864 [8]   mas/yr
Dec.: −27.909±0.792 [8]   mas/yr
Parallax (π)11.0982 ± 0.4267  mas
Distance 290 ± 10  ly
(90 ± 3  pc)
B
Proper motion (μ)RA: −36.737±0.266 [9]   mas/yr
Dec.: −23.774±0.189 [9]   mas/yr
Parallax (π)10.2659 ± 0.1380  mas [9]
Distance 318 ± 4  ly
(97 ± 1  pc)
Orbit [10]
PrimaryBa
CompanionBb
Period (P)17.428 d
Eccentricity (e)0.21
Periastron epoch (T)2443296.44 JD
Argument of periastron (ω)
(secondary)		15°
Semi-amplitude (K1)
(primary)		17 km/s
Details
3 Cen A
Mass 5.0±0.1 [11]   M☉
Surface gravity (log g)3.80 [12]   cgs
Temperature 17,500 [12]   K
Age 47.4±7.3 [11]   Myr
3 Cen B
Mass 2.47±0.10 [5]   M☉
Radius 2.8 [13]   R☉
Luminosity50.2+11.7
−9.5 [5]   L☉
Temperature 9,638+67
−66 [5]   K
Rotational velocity (v sin i)135 [5]  km/s
Other designations
k Centauri, 3 Cen, V983 Centauri, HIP  67669, WDS J13518-3300 [14]
3 Cen A: GC  18724, HD  120709, HR  5210, SAO  204916
3 Cen B: GC  18725, HD  120710, HR  5211, SAO  204917
Database references
SIMBAD data
A
B

3 Centauri is a triple star [3] system in the southern constellation of Centaurus, [14] located approximately 300 light years from the Sun. [8] [9] It is visible to the naked eye as a faint, blue-white hued star with a combined apparent visual magnitude of 4.32. [2] As of 2017, the two visible components had an angular separation of 7.851″ along a position angle of 106°. [3] The system has the Bayer designation k Centauri; 3 Centauri is the Flamsteed designation. It was a suspected eclipsing binary with a variable star designation V983 Centauri, [6] however the AAVSO website lists it as non-variable, formerly suspected to be variable. [15]

The brighter member, designated component A, is a magnitude 4.52 [3] chemically peculiar star of the helium-weak (CP4) variety, and has a stellar classification of B5 III-IVp. [4] The spectrum of the star displays overabundances of elements such as nitrogen, phosphorus, manganese, iron, and nickel, while carbon, oxygen, magnesium, aluminium, sulfur, and chlorine appear underabundant relative to the Sun. [12] Weak emission line features are also visible. [16]

The magnitude 5.97 [3] secondary, component B, is a single-lined spectroscopic binary star system with an orbital period of 17.4 days and an eccentricity of 0.21. [10] The pair have an angular separation of 2.485  mas . The visible component is a B-type main-sequence star with a class of B8 V. [5]

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<span class="mw-page-title-main">Y Centauri</span> Variable star in the constellation Centaurus

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References

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  4. 1 2 Sigut, T. A. A.; et al. (February 2000). "Emission Lines in the Spectrum of the 3HE Star 3 Centauri A". The Astrophysical Journal. 530 (2): L89–L92. arXiv: astro-ph/0001090 . Bibcode:2000ApJ...530L..89S. doi:10.1086/312499. PMID   10655172. S2CID   30530913.
  5. 1 2 3 4 5 6 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID   55586789.
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  7. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  8. 1 2 3 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.
  9. 1 2 3 4 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.
  10. 1 2 Pourbaix, D.; et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics. 424: 727–732. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID   119387088.
  11. 1 2 Tetzlaff, N.; et al. (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: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . S2CID   118629873.
  12. 1 2 3 Sadakane, Kozo; Nishimura, Masayoshi (June 2018). "Spectroscopic abundance analyses of the 3He stars HD 185330 and 3 Cen A". Publications of the Astronomical Society of Japan. 70 (3): 40. arXiv: 1802.10087 . Bibcode:2018PASJ...70...40S. doi:10.1093/pasj/psy031. 40.
  13. ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics. 367 (Third ed.): 521–524. arXiv: astro-ph/0012289 . Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID   425754.
  14. 1 2 "3 Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-11.
  15. ↑ "V0983 Cen". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 22 September 2024.
  16. ↑ Wahlgren, G. M.; Hubrig, S. (May 2004). "Emission lines in the optical spectrum of 3 Cen A". Astronomy and Astrophysics. 418 (3): 1073–1081. Bibcode:2004A&A...418.1073W. doi: 10.1051/0004-6361:20034257 .
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