Astronomy:G Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 26m 31.75955s[1] |
| Declination | −51° 27′ 02.2899″[1] |
| Apparent magnitude (V) | 4.82[2] |
| Characteristics | |
| Spectral type | B3V(n)[3] |
| B−V color index | −0.141±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | +5.0±4.2[2] km/s |
| Proper motion (μ) | RA: −30.66[1] mas/yr Dec.: −10.13[1] mas/yr |
| Parallax (π) | 7.28 ± 0.24[1] mas |
| Distance | 450 ± 10 ly (137 ± 5 pc) |
| Absolute magnitude (MV) | −0.87[2] |
| Details | |
| Mass | 6.2±0.1[4] M☉ |
| Radius | 3.42[5] R☉ |
| Luminosity | 483.06[2] L☉ |
| Temperature | 13,732[6] K |
| Metallicity [Fe/H] | −0.38±0.06[7] dex |
| Rotational velocity (v sin i) | 298±12[8] km/s |
| Age | 15.8±0.2[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
G Centauri is a single[10] star in the southern constellation of Centaurus. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.82. This object is located approximately 450 light years from the Sun, based on parallax.[1] It is a member of the Lower Centaurus–Crux group of the Scorpius–Centaurus association, with the former having an age of about 17 million years.[11]
This object is a B-type main-sequence star with a stellar classification of B3V(n),[3] where the 'n' indicates "nebulous" (broad) lines due to rapid rotation. It is around 16[4] million years old with a projected rotational velocity of up to 298 km/s.[8] The star has six[4] times the mass of the Sun and 3.4[5] times the Sun's radius. It is radiating 483[2] times the luminosity of the Sun from its photosphere at an effective temperature of 13,732 K.[6] An infrared excess indicates a circumstellar disk of dust with a mean temperature of 50 K is orbiting the star at a separation of 717.8 astronomical unit|AU.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 4.2 4.3 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 5.0 5.1 5.2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series 225 (1): 24, doi:10.3847/0067-0049/225/1/15, 15, Bibcode: 2016ApJS..225...15C.
- ↑ 6.0 6.1 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ Gáspár, András et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal 826 (2): 171, doi:10.3847/0004-637X/826/2/171, Bibcode: 2016ApJ...826..171G.
- ↑ 8.0 8.1 Brown, A. G. A.; Verschueren, W. (1997), "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2", Astronomy and Astrophysics 319: 811, Bibcode: 1997A&A...319..811B. Note: "The He i λ4026 line in this star is broader than the models. The value of vsini may thus be overestimated."
- ↑ "G Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+Cen.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Jang-Condell, Hannah et al. (August 2015), "Spitzer IRS Spectra of Debris Disks in the Scorpius–Centaurus OB Association", The Astrophysical Journal 808 (2): 19, doi:10.1088/0004-637X/808/2/167, 167, Bibcode: 2015ApJ...808..167J.
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