Psi Centauri

ψ Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 14h 20m 33.43s[1]
Declination −37° 53′ 07.1″[1]
Apparent magnitude (V) +4.05[2]
Characteristics
Spectral type A0 IV[3]
U−B color index −0.11[3]
B−V color index −0.03[3]
Variable type none
Astrometry
Radial velocity (Rv)−5 km/s
Proper motion (μ) RA: −63.69±0.18[1] mas/yr
Dec.: −10.65±0.15[1] mas/yr
Parallax (π)12.60 ± 0.20[1] mas
Distance259 ± 4 ly
(79 ± 1 pc)
Absolute magnitude (MV)−0.35±0.14[4]
Details
ψ Cen A
Mass3.114[5] M☉
Radius3.634[5] R☉
Luminosity141[5] L☉
Surface gravity (log g)3.76±0.04[4] cgs
Temperature10,450[5] K
Rotational velocity (v sin i)101[4] km/s
Age269[4] Myr
ψ Cen B
Mass1.909[5] M☉
Radius1.811[5] R☉
Luminosity18[5] L☉
Temperature8,800[5] K
Other designations
ψ Cen, CD−37° 9336, FK5 1373, GC 19337, HD 125473, HIP 70090, HR 5367, SAO 205453, CCDM J14206-3753
Database references
SIMBADdata

Psi Centauri (ψ Cen, ψ Centauri) is a binary star[6] system in the constellation Centaurus. The primary component is a white A-type subgiant with an apparent magnitude of +4.05.[2] It is approximately 259 light years from Earth. The pair are orbiting each other with a period of 38.81 days and an eccentricity of 0.55.[6] The system displays an infrared excess at a wavelength of 60 μm, indicating the presence of a circumstellar debris disk with a temperature of 120 K, orbiting at a distance of 64 AU.[7]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4, Bibcode:1962MtSOM...4....1B.
  4. 1 2 3 4 Gerbaldi, M.; et al. (June 1999), "Search for reference A0 dwarf stars: Masses and luminosities revisited with HIPPARCOS parallaxes", Astronomy and Astrophysics Supplement, 137 (2): 273–292, Bibcode:1999A&AS..137..273G, doi:10.1051/aas:1999248.
  5. 1 2 3 4 5 6 7 8 Eker, Z.; et al. (April 2015), "Main-Sequence Effective Temperatures from a Revised Mass-Luminosity Relation Based on Accurate Properties", The Astronomical Journal, 149 (4): 16, arXiv:1501.06585, Bibcode:2015AJ....149..131E, doi:10.1088/0004-6256/149/4/131, 131.
  6. 1 2 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.
  7. ↑ Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555, Bibcode:2007ApJ...660.1556R, doi:10.1086/509912.
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