G Centauri
{{Short description|Star in the constellation Centaurus}}
{{about|G Centauri|g Centauri|2 Centauri}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Centaurus
| dec = {{DEC|−51|27|02.2899}}
}}
{{Starbox character
| type =
| u-b =
| variable =
}}
{{Starbox astrometry
| parallax = 7.28
| p_error = 0.24
}}
{{Starbox detail
| component1 =
| rotational_velocity = {{Val|298|12}}
| gravity =
| metal_fe = {{Val|−0.38|0.06}}
}}
{{Starbox catalog
| names = {{odlist | B=G Cen | CD=−50°6975 | HD=108257 | HIP=60710 | HR=4732 | SAO=239948 | GC=16954 | CCDM=J12265-5127 }}
}}
{{Starbox reference
| Simbad = G+Cen
}}
{{Starbox end}}
G Centauri is a single 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. 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.
This object is a B-type main-sequence star with a stellar classification of B3V(n), where the 'n' indicates "nebulous" (broad) lines due to rapid rotation. It is around 16 million years old with a projected rotational velocity of up to 298 km/s. The star has six times the mass of the Sun and 3.4 times the Sun's radius. It is radiating 483 times the luminosity of the Sun from its photosphere at an effective temperature of 13,732 K. An infrared excess indicates a circumstellar disk of dust with a mean temperature of 50 K is orbiting the star at a separation of {{Val|717.8|ul=AU}}.
References
{{Reflist|refs=
{{cite simbad | title=G Cen | access-date=2019-08-15 }}
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | year=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644
}}
| last1=Houk | first1=Nancy
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=2 | publication-place=Ann Arbor | year=1978
| publisher=Dept. of Astronomy, University of Michigan
| bibcode=1978mcts.book.....H | postscript=.}}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}
| display-authors=1 | last1=Tetzlaff | first1=N.
| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.
| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun
| journal=Monthly Notices of the Royal Astronomical Society
| volume=410 | issue=1 | pages=190–200 | date=January 2011
| bibcode=2011MNRAS.410..190T | arxiv=1007.4883
| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | s2cid=118629873 }}
| title=A Comprehensive Census of Nearby Infrared Excess Stars
| last1=Cotten | first1=Tara H. | last2=Song | first2=Inseok
| journal=The Astrophysical Journal Supplement Series
| volume=225 | issue=1 | id=15 | pages=24 | date=July 2016
| doi=10.3847/0067-0049/225/1/15 | postscript=.
| bibcode=2016ApJS..225...15C | arxiv=1606.01134 | s2cid=118438871 | doi-access=free }}
| title=The Correlation between Metallicity and Debris Disk Mass
| journal=The Astrophysical Journal
| display-authors=1 | last1=Gáspár | first1=András
| last2=Rieke | first2=George H | last3=Ballering | first3=Nicholas
| volume=826 | issue=2 | pages=171 | year=2016
| doi=10.3847/0004-637X/826/2/171 | postscript=.
| bibcode=2016ApJ...826..171G | arxiv=1604.07403 | s2cid=119241004
| doi-access=free
}}
| title=Spitzer IRS Spectra of Debris Disks in the Scorpius–Centaurus OB Association
| last1=Jang-Condell | first1=Hannah | last2=Chen | first2=Christine H.
| last3=Mittal | first3=Tushar | last4=Manoj | first4=P.
| last5=Watson | first5=Dan | last6=Lisse | first6=Carey M.
| last7=Nesvold | first7=Erika | last8=Kuchner | first8=Marc
| journal=The Astrophysical Journal | display-authors=1
| volume=808 | issue=2 | id=167 | pages=19 | date=August 2015
| doi=10.1088/0004-637X/808/2/167 | postscript=.
| bibcode=2015ApJ...808..167J | arxiv=1506.05428 | s2cid=118549483 }}
| last1=Brown | first1=A. G. A. | last2=Verschueren | first2=W.
| title=High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2
| journal=Astronomy and Astrophysics | postscript=.
| volume=319 | pages=811 | year=1997
| bibcode=1997A&A...319..811B | arxiv=astro-ph/9608089
}} Note: "The He i λ4026 line in this star is broader than the models. The value of vsini may thus be overestimated."
| display-authors=1 | last1=McDonald | first1=I.
| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L.
| title=Fundamental parameters and infrared excesses of Hipparcos stars
| journal=Monthly Notices of the Royal Astronomical Society
| volume=427 | pages=343–357 | year=2012 | issue=1 | postscript=.
| bibcode=2012MNRAS.427..343M | arxiv=1208.2037
| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 }}
}}
{{Stars of Centaurus}}
{{DEFAULTSORT:G Centauri}}
Category:B-type main-sequence stars