Psi Centauri
Appearance
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 mas[1] |
Distance | 259 ± 4 ly (79 ± 1 pc) |
Absolute magnitude (MV) | −0.35±0.14[4] |
Details | |
ψ Cen A | |
Mass | 3.114[5] M☉ |
Radius | 3.634[5] R☉ |
Luminosity | 141[5] L☉ |
Surface gravity (log g) | 3.76±0.04[4] cgs |
Temperature | 10,450[5] K |
Rotational velocity (v sin i) | 101[4] km/s |
Age | 269[4] Myr |
ψ Cen B | |
Mass | 1.909[5] M☉ |
Radius | 1.811[5] R☉ |
Luminosity | 18[5] L☉ |
Temperature | 8,800[5] K |
Other designations | |
Database references | |
SIMBAD | data |
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
- ^ a b c d e 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
- ^ a b 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.
- ^ a b c Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4, Bibcode:1962MtSOM...4....1B.
- ^ a b c d 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.
- ^ a b c d e f g h 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.
- ^ a b 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.
- ^ 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.