View source for Astronomy:Gliese 674

{{Short description|Star in the constellation Ara}}
{{Starbox begin}}
{{Starbox observe
 | epoch       = J2000
 | constell    = [[Astronomy:Ara (constellation)|Ara]]
 | ra          = {{RA|17|28|39.9455}}<ref name="Gaia DR2"/>
 | dec         = {{DEC|–46|53|42.6932}}<ref name="Gaia DR2"/>
 | appmag_v    = 9.38<ref name=Anderson_Francis_2012/>
}}
{{Starbox character
 | type        = 
 | class       = M3V<ref name=Torres_et_al_2006/>
 | r-i         = 1.33<ref name=Koen_et_al_2010/><!-- 8.337 - 7.006 = 1.331 -->
 | v-r         = 
 | b-v         = 1.553{{±|0.017}}<ref name=Anderson_Francis_2012/>
 | u-b         = 1.20<ref name=Koen_et_al_2010/><!-- 12.177 - 10.973 = 1.204 -->
 | variable    =  
}}
{{Starbox astrometry
 | radial_v    = −2.904{{±|0.0004}}<ref name=Soubiran_et_al_2018/>
 | prop_mo_ra  = 572.582{{±|0.102}}
 | prop_mo_dec = −880.251{{±|0.068}}
 | pm_footnote = <ref name="Gaia DR2"/>
 | parallax    = 219.6463
 | p_error     = 0.0262
 | parallax_footnote = <ref name="GaiaEDR3">{{Cite Gaia EDR3|5951824121022278144}}</ref>
 | absmag_v    = 11.09<ref name=Anderson_Francis_2012/>
}}
{{Starbox detail
 | mass        = 0.353{{±|0.008}}<ref name=Pineda_et_al_2021/>
 | radius      = {{val|0.361|0.012|0.011}}<ref name=Pineda_et_al_2021/>
 | gravity     =  
 | luminosity  = 0.01575{{±|0.00037}}<ref name=Pineda_et_al_2021/>
 | temperature = {{val|3404|59|57|fmt=commas}}<ref name=Pineda_et_al_2021/>
 | metal_fe    = −0.30{{±|0.08}}<ref name=Pineda_et_al_2021/>
 | rotation    = {{Val|32.9|0.1|u=d}}<ref name=mnras452_3_2745/>
 | age_gyr     = 0.1–1.0<ref name="Bonfils2007"/>
 | rotational_velocity = 3.2{{±|1.2}}<ref name=Torres_et_al_2006/>
}}
{{Starbox catalog
 | names = {{odlist | GJ=674 | CD=-46°11540 | GCTP=3958.00 | LHS=449 | LFT=1351 | LTT=6942 | LPM=645 | HIP=85523 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad  = Gliese+674|sn=The star
 | Simbad2 = GJ+674+b|sn2=b
 | NSTED   = GJ+674
 | ARICNS  = 01403
 | EPE     = GJ+674
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Ara_constellation_map.svg
|alt=Gliese 674 is located in the constellation Ara.
|caption=Location of Gliese 674 in the constellation [[Astronomy:Ara (constellation)|Ara]]|border=infobox|mark=Red_pog.png|width=350
|label=Gliese 674
|position=right
|lat=71.7
|long=50.9
}}|caption=
}}
{{Starbox end}}

'''Gliese 674''' '''(GJ 674)''' is a small [[Astronomy:Red dwarf|red dwarf]] [[Astronomy:Star|star]] with an [[Astronomy:Exoplanet|exoplanet]]ary companion in the southern [[Astronomy:Constellation|constellation]] of [[Astronomy:Ara (constellation)|Ara]]. It is too faint to be visible to the naked eye, having an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of 9.38<ref name=Anderson_Francis_2012/> and an [[Astronomy:Absolute magnitude|absolute magnitude]] of 11.09.<ref name=Anderson_Francis_2012/> The system is located at a distance of 14.8&nbsp;[[Astronomy:Light-year|light-year]]s from the [[Astronomy:Sun|Sun]] based on [[Astronomy:Stellar parallax|parallax]] measurements,<ref name="Gaia DR2"/> but is drifting closer with a [[Astronomy:Radial velocity|radial velocity]] of −2.9&nbsp;km/s.<ref name=Soubiran_et_al_2018/> It is a candidate member of the 200&nbsp;million year old [[Astronomy:Castor Moving Group|Castor stream]] of co-moving stars.<ref name=Caballero2010/>

This is a low-mass M-type main-sequence star with a [[Astronomy:Stellar classification|stellar classification]] of M3V.<ref name=Torres_et_al_2006/> The star is weakly [[Astronomy:Magnetic activity|active]] and show star spots on a regular basis. Even low activity red dwarfs can [[Astronomy:Flare star|flare]], and in 2018 this star was observed emitting a hot ultraviolet flare with a total energy of {{val|5.6e23|ul=Joules}} and a duration of a few hours. GJ 674 is at an intermediate stage of spin-down with a rotation period of 33.4&nbsp;days, suggesting an age of up to a few billion years.<ref name=Christian_Schneider_et_al_2019/> It is smaller and less massive than the Sun, and is radiating just 1.6%<ref name="Bonfils2007"/> of the Sun's luminosity from its [[Astronomy:Photosphere|photosphere]] at an [[Astronomy:Effective temperature|effective temperature]] of 3,404&nbsp;K.<ref name=Pineda_et_al_2021/>

==Planetary system==
On January 7, 2007, Bonfils used the HARPS spectrograph in ESO and found an intermediate mass planet orbiting close to the red dwarf star in an eccentric orbit.<ref name="Bonfils2007"/> This system is a promising candidate for detecting radio emission caused by interaction between the planet and the [[Astronomy:Stellar wind|stellar wind]].<ref name=Vidotto_et_al_2019/>

{{OrbitboxPlanet begin
 | table_ref = <ref name="Bonfils2007"/>
}}
{{OrbitboxPlanet
 | exoplanet = [[Astronomy:Gliese 674 b|b]]
 | mass_earth = ≥11.8
 | period = 4.6938 ± 0.007
 | semimajor = 0.039
 | eccentricity = 0.2 ± 0.02
}}
{{Orbitbox end}}

==See also==
* [[Astronomy:List of nearest stars and brown dwarfs|List of nearest stars and brown dwarfs]]
* [[Astronomy:Lists of exoplanets|Lists of exoplanets]]

==References==
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad
 | title=CD-46 11540 | access-date=2021-11-22 }}</ref>

<ref name="Gaia DR2">{{Cite Gaia DR2|5951824121022278144}}</ref>

<ref name=Anderson_Francis_2012>{{cite journal
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | title=XHIP: An extended hipparcos compilation
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | arxiv=1108.4971
 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=Koen_et_al_2010>{{cite journal
 | title=UBV(RI)<sub>C</sub>JHK observations of Hipparcos-selected nearby stars
 | last1=Koen | first1=C. | last2=Kilkenny | first2=D.
 | last3=van Wyk | first3=F. | last4=Marang | first4=F.
 | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=403 | issue=4 | date=April 21, 2010 | pages=1949–1968
 | doi=10.1111/j.1365-2966.2009.16182.x | doi-access=free
 | bibcode=2010MNRAS.403.1949K }}</ref>

<ref name=Soubiran_et_al_2018>{{cite journal
 | title=Gaia Data Release 2. The catalogue of radial velocity standard stars
 | last1=Soubiran | first1=C. | last2=Jasniewicz | first2=G.
 | last3=Chemin | first3=L. | last4=Zurbach | first4=C.
 | last5=Brouillet | first5=N. | last6=Panuzzo | first6=P.
 | last7=Sartoretti | first7=P. | last8=Katz | first8=D.
 | last9=Le Campion | first9=J. -F. | last10=Marchal | first10=O.
 | last11=Hestroffer | first11=D. | last12=Thévenin | first12=F.
 | last13=Crifo | first13=F. | last14=Udry | first14=S.
 | last15=Cropper | first15=M. | last16=Seabroke | first16=G.
 | last17=Viala | first17=Y. | last18=Benson | first18=K.
 | last19=Blomme | first19=R. | last20=Jean-Antoine | first20=A.
 | last21=Huckle | first21=H. | last22=Smith | first22=M.
 | last23=Baker | first23=S. G. | last24=Damerdji | first24=Y.
 | last25=Dolding | first25=C. | last26=Frémat | first26=Y.
 | last27=Gosset | first27=E. | last28=Guerrier | first28=A.
 | last29=Guy | first29=L. P. | last30=Haigron | first30=R.
 | display-authors=1 | journal=Astronomy and Astrophysics
 | volume=616 | pages=A7 | year=2018
 | bibcode=2018A&A...616A...7S | arxiv=1804.09370
 | doi=10.1051/0004-6361/201832795 | s2cid=52952408 }}</ref>

<ref name="Bonfils2007">{{cite journal
 | title=The HARPS search for southern extra-solar planets. X. A m sin i = 11 M<sub>🜨</sub> planet around the nearby spotted M dwarf GJ 674
 | url=http://www.aanda.org/articles/aa/full/2007/40/aa7068-07/aa7068-07.html
 | last1=Bonfils | first1=X. | last2=Mayor | first2=M.
 | last3=Delfosse | first3=X. | last4=Forveille | first4=T.
 | last5=Gillon | first5=M. | last6=Perrier | first6=C.
 | last7=Udry | first7=S. | last8=Bouchy | first8=F.
 | last9=Lovis | first9=C. | last10=Pepe | first10=F.
 | last11=Queloz | first11=D. | last12=Santos | first12=N. C.
 | last13=Bertaux | first13=J.-L. | display-authors=1
 | journal=Astronomy and Astrophysics
 | volume=474 | issue=1 | pages=293–299 | year=2007
 | arxiv=0704.0270 | bibcode=2007A&A...474..293B
 | doi=10.1051/0004-6361:20077068 | s2cid=119671420 }}</ref>

<ref name=mnras452_3_2745>{{cite journal
 | title=Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators 
 | last1=Suárez Mascareño | first1=A. | last2=Rebolo | first2=R.
 | last3=González Hernández | first3=J. I. | last4=Esposito | first4=M.
 | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=452 | issue=3 | pages=2745–2756 | date=September 2015
 | doi=10.1093/mnras/stv1441 | bibcode=2015MNRAS.452.2745S 
 | arxiv=1506.08039 | s2cid=119181646 }}</ref>

<ref name=Christian_Schneider_et_al_2019>{{cite journal
 | title=A Hot Ultraviolet Flare on the M Dwarf Star GJ 674
 | display-authors=1 | last1=Froning | first1=C. S.
 | last2=Kowalski | first2=A. | last3=France | first3=K.
 | last4=Parke Loyd | first4=R. O. | last5=Christian Schneider | first5=P.
 | last6=Youngblood | first6=A. | last7=Wilson | first7=D.
 | last8=Brown | first8=A. | last9=Berta-Thompson | first9=Z.
 | last10=Sebastian Pineda | first10=J. | last11=Linsky | first11=J.
 | last12=Rugheimer | first12=S. | last13=Miguel | first13=Y.
 | journal=The Astrophysical Journal Letters
 | volume=871 | issue=2 | id=L26 | pages=6 | date=February 2019
 | doi=10.3847/2041-8213/aaffcd | arxiv=1901.08647
 | bibcode=2019ApJ...871L..26F | s2cid=119427057 | doi-access=free }}</ref>

<ref name=Torres_et_al_2006>{{cite journal
 | title=Search for associations containing young stars (SACY). I. Sample and searching method
 | last1=Torres | first1=G. R. | last2=Quast | first2=G. R.
 | last3=da Silva | first3=L. | last4=de La Reza | first4=R.
 | last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M.
 | display-authors=1 | journal=Astronomy and Astrophysics
 | volume=460 | issue=3 | pages=695–708 | date=December 2006
 | doi=10.1051/0004-6361:20065602 | s2cid=16080025
 | bibcode=2006A&A...460..695T | arxiv=astro-ph/0609258 }}</ref>

<ref name=Caballero2010>{{cite journal
 | title=Reaching the boundary between stellar kinematic groups and very wide binaries . II. α Librae + KU Librae: a common proper motion system in Castor separated by 1.0 pc
 | last=Caballero | first=J. A.
 | journal=Astronomy and Astrophysics
 | volume=514 | id=A98 | pages=7 | date=May 2010
 | doi=10.1051/0004-6361/200913986 | arxiv=1001.5432
 | bibcode=2010A&A...514A..98C | s2cid=118875432 }}</ref>

<ref name=Vidotto_et_al_2019>{{cite journal
 | title=Can we detect aurora in exoplanets orbiting M dwarfs?
 | display-authors=1 | last1=Vidotto | first1=A. A.
 | last2=Feeney | first2=N. | last3=Groh | first3=J. H.
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=488 | issue=1 | pages=633–644 | date=September 2019
 | doi=10.1093/mnras/stz1696 | arxiv=1906.07089
 | bibcode=2019MNRAS.488..633V }}</ref>

<ref name=Pineda_et_al_2021>{{cite journal
 | title=The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars
 | last1=Pineda | first1=J. Sebastian | last2=Youngblood | first2=Allison
 | last3=France | first3=Kevin | display-authors=1
 | journal=The Astrophysical Journal
 | volume=918 | issue=1 | id=40 | pages=23 | date=September 2021
 | doi=10.3847/1538-4357/ac0aea | arxiv=2106.07656
 | bibcode=2021ApJ...918...40P | s2cid=235435757 | doi-access=free }}</ref>

}}

==External links==
* {{cite web|url=http://nstars.arc.nasa.gov/searches/starinfo.cfm?partb=1728m4653&starpage=0 |title=Gliese 674 |work=nStars database entry |url-status=dead |archiveurl=https://web.archive.org/web/20050428183048/http://nstars.arc.nasa.gov/searches/starinfo.cfm?partb=1728m4653&starpage=0 |archivedate=April 28, 2005 }}
* {{cite web | url=http://www.solstation.com/stars/gl674.htm | title=Gliese 674 | work=SolStation}}
* [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?GJ%20674 GJ 674] Catalog
* [http://aladin.u-strasbg.fr/AladinPreview?-c=17+28+39.9463-46+53+42.685&ident=LHS+++449&submit=Aladin+previewer Image Gliese 674]

==Notes==
{{reflist|group=note}}

{{nearest systems|3}}
{{Stars of Ara}}
{{Sky|17|28|39.9463|-|46|53|42.685|14.849}}

{{DEFAULTSORT:Gliese 674}}
<!-- Properties -->
[[Category:M-type main-sequence stars]]
[[Category:Planetary systems with one confirmed planet]]
<!-- Other -->
[[Category:Ara (constellation)]]
[[Category:Durchmusterung objects|CD-46 11540]]
[[Category:Gliese and GJ objects|0674]]
[[Category:Hipparcos objects|085523]]

{{Sourceattribution|Gliese 674}}