G Centauri

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G Centauri
Observation data
Epoch J2000       Equinox J2000
Constellation Centaurus [1]
Right ascension 12h 26m 31.75955s [2]
Declination −51° 27′ 02.2899″ [2]
Apparent magnitude  (V)4.82 [1]
Characteristics
Spectral type B3V(n) [3]
B−V color index −0.141±0.002 [1]
Astrometry
Radial velocity (Rv)+5.0±4.2 [1] km/s
Proper motion (μ)RA: −30.66 [2] mas/yr
Dec.: −10.13 [2] mas/yr
Parallax (π)7.28±0.24  mas [2]
Distance 450 ± 10  ly
(137 ± 5  pc)
Absolute magnitude  (MV)−0.87 [1]
Details
Mass 6.2±0.1 [4]   M☉
Radius 3.42 [5]   R☉
Luminosity 483.06 [1]   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
G Cen, CD−50°6975, GC 16954, HD 108257, HIP 60710, HR 4732, SAO 239948, CCDM J12265-5127 [9]
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. [2] 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 [1] 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  AU . [5]

References

  1. 1 2 3 4 5 6 7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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, S2CID   18759600.
  3. 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 1 2 3 4 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.
  5. 1 2 3 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv: 1606.01134 , Bibcode:2016ApJS..225...15C, doi: 10.3847/0067-0049/225/1/15 , S2CID   118438871, 15.
  6. 1 2 McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv: 1208.2037 , Bibcode:2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x , S2CID   118665352.
  7. ↑ Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv: 1604.07403 , Bibcode:2016ApJ...826..171G, doi: 10.3847/0004-637X/826/2/171 , S2CID   119241004.
  8. 1 2 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, arXiv: astro-ph/9608089 , 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."
  9. ↑ "G Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-08-15.
  10. ↑ 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 , S2CID   14878976.
  11. ↑ 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, arXiv: 1506.05428 , Bibcode:2015ApJ...808..167J, doi:10.1088/0004-637X/808/2/167, S2CID   118549483, 167.
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