3 Centauri

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Template:Short description Template:About-distinguish

3 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.32[2] (4.52 + 5.97)[3]
Characteristics
Spectral type B5 III-IVp[4] + B8 V[5]
B−V Template:Engvar Template:Val[2]
Variable type Eclipsing?[6]
Astrometry
Radial velocity (Rv)Template:Val[7] km/s
Absolute magnitude (MV)−0.46[2]
A
Proper motion (μ) RA: Template:Val[8] mas/yr
Dec.: Template:Val[8] mas/yr
Parallax (π)11.0982±0.4267 mas
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
B
Proper motion (μ) RA: Template:Val[9] mas/yr
Dec.: Template:Val[9] mas/yr
Parallax (π)10.2659±0.1380 mas[9]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd 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
MassTemplate:Val[11] Template:Solar mass
Surface gravity (log g)3.80[12] cgs
Temperature17,500[12] K
AgeTemplate:Val[11] Myr
3 Cen B
MassTemplate:Val[5] Template:Solar mass
Radius2.8[13] Template:Solar radius
LuminosityTemplate:Val[5] Template:Solar luminosity
TemperatureTemplate:Val[5] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)135[5] km/s
Other designations
Template:Odlist[14]
3 Cen A: Template:Odlist
3 Cen B: Template:Odlist
Database references
SIMBADdata
A
B

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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 Template:Val 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 Template:Val. The visible component is a B-type main-sequence star with a class of B8 V.[5]

References

Template:Reflist

Template:Stars of Centaurus

  1. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named van Leeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Veramendi2014
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Sigut2000
  5. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named zorec2012
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Samus2017
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2006
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named dr2a
  9. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named dr2b
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Pourbaix2004
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Tetzlaff2011
  12. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Sadakane2018
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named PasinettiFracassini2001
  14. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named AAVSO
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Wahlgren2004
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