G Centauri

{{Short description|Star in the constellation Centaurus}} {{about|G Centauri|g Centauri|2 Centauri}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Centaurus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=G Centauri |x=735|y=670 }} | caption = Location of G Centauri (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Centaurus]]<ref name=Anderson2012/> | ra = {{RA|12|26|31.75955}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−51|27|02.2899}}<ref name=vanLeeuwen2007/> | appmag_v = 4.82<ref name=Anderson2012/> }} {{Starbox character | type = | class = B3V(n)<ref name=houk1978/> | b-v = {{Val|−0.141|0.002}}<ref name=Anderson2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|+5.0|4.2}}<ref name=Anderson2012/> | prop_mo_ra = −30.66<ref name=vanLeeuwen2007/> | prop_mo_dec = −10.13<ref name=vanLeeuwen2007/> | parallax = 7.28 | p_error = 0.24 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −0.87<ref name=Anderson2012/> }} {{Starbox detail | component1 = | mass = {{Val|6.2|0.1}}<ref name=Tetzlaff2011/> | radius = 3.42<ref name=Cotten2016/> | luminosity = 483.06<ref name=Anderson2012/> | temperature = 13,732<ref name=McDonald2012/> | rotational_velocity = {{Val|298|12}}<ref name=brown1997/> | gravity = | metal_fe = {{Val|−0.38|0.06}}<ref name=gaspar2016/> | age_myr = {{Val|15.8|0.2}}<ref name=Tetzlaff2011/> }} {{Starbox catalog | names = {{odlist | B=G Cen | CD=−50°6975 | HD=108257 | HIP=60710 | HR=4732 | SAO=239948 | GC=16954 | CCDM=J12265-5127 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = G+Cen }} {{Starbox end}}

'''G Centauri''' is a single<ref name=Eggleton2008/> [[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 year]]s from the Sun, based on [[stellar parallax|parallax]].<ref name=vanLeeuwen2007/> 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.<ref name=Condell2015/>

This object is a [[B-type main-sequence star]] with a [[stellar classification]] of B3V(n),<ref name=houk1978/> where the 'n' indicates "nebulous" (broad) [[absorption line|lines]] due to rapid rotation. It is around 16<ref name=Tetzlaff2011/> million years old with a [[projected rotational velocity]] of up to 298 km/s.<ref name=brown1997/> The star has six<ref name=Tetzlaff2011/> times the [[mass of the Sun]] and 3.4<ref name=Cotten2016/> times the [[Sun's radius]]. It is radiating 483<ref name=Anderson2012/> times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 13,732 K.<ref name=McDonald2012/> 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}}.<ref name=Cotten2016/>

== References == {{Reflist|refs=

<ref name=SIMBAD>{{cite simbad | title=G Cen | access-date=2019-08-15 }}</ref>

<ref name=vanLeeuwen2007>{{citation | 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=. }}</ref>

<ref name=houk1978>{{citation | 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=.}}</ref>

<ref name=Eggleton2008>{{citation | 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 }}</ref>

<ref name=Tetzlaff2011>{{citation | postscript=. | 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 }}</ref>

<ref name=Cotten2016>{{citation | 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 }}</ref>

<ref name=gaspar2016>{{citation | 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 }}</ref>

<ref name=Condell2015>{{citation | 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 }}</ref>

<ref name=brown1997>{{citation | 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."</ref>

<ref name=McDonald2012>{{citation | 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 }}</ref>

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{{Stars of Centaurus}}

[[Category:B-type main-sequence stars]] [[Category:Circumstellar disks]]  [[Category:Centaurus]] [[Category:Bayer objects|Centauri, G]] [[Category:Durchmusterung objects|CD-50 06975]] [[Category:Henry Draper Catalogue objects|108257]] [[Category:Hipparcos objects|060710]] [[Category:Bright Star Catalogue objects|4732]] [[Category:Lower Centaurus Crux]]