{{Short description|Triple star system in the constellation Boötes}} {{Starbox begin}} {{Starbox observe | epoch = J2000.0 | constell = [[Boötes]]<ref name=Anderson2012/> | ra = {{RA|14|40|21.86915}}<ref name=GaiaDR3/> | dec = {{DEC|+21|58|33.1217}}<ref name=GaiaDR3/> | appmag_v = 6.13<ref name=Anderson2012/> }} {{Starbox character | type = | class = G0V<ref name=Harlan1970/> or F4III<ref name=cowley1979/> | b-v = {{Val|0.434|0.004}}<ref name=Anderson2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|+1.667|0.0024}}<ref name=GaiaDR2/> | prop_mo_ra = +15.157<ref name=GaiaDR3/> | prop_mo_dec = −39.067<ref name=GaiaDR3/> | parallax = 10.0986 | p_error = 0.1285 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = 0.82<ref name=Anderson2012/> }} {{Starbox orbit | reference = <ref name=Barlow1991/> | primary = Aa1 | name = Aa2 | period_unitless = {{Val|101.606|0.003|u=days}} | axis = <!--Semimajor axis (in arcseconds)--> | axis_unitless = {{Val|26.4|0.2|ul=Gm|p=≥}} | eccentricity = {{Val|0.117|0.007}} | periastron = {{Val|2442478.0|0.8|ul=HJD|fmt=commas}} | k1 = {{Val|19.0|0.1}} }} {{Starbox orbit | reference = <ref name=Barlow1991/> | primary = Aa | name = Ab | period_unitless = {{Val|3385|7|u=days|fmt=commas}} | axis = {{Val|0.074|0.001}} | axis_unitless = {{Val|407|6|u=Gm}} | eccentricity = {{Val|0.073|0.010}} | inclination = {{Val|104.6|0.5}} | periastron = {{Val|2442880|40|ul=HJD|fmt=commas}} | periarg = {{Val|91.4|4.1}} | k1 = {{Val|8.5|0.1}} }} {{Starbox detail | component1 = Aa1 | mass = 1.99<ref name=Earle2017/> | radius = {{Val|17.0|1.7|1.6}}<ref name=GaiaDR2/> | metal_fe = | gravity = 3.41<ref name=Earle2017/> | age_gyr = 1.00<ref name=Earle2017/> | luminosity = {{Val|236.1|5.9|5.7}}<ref name=GaiaDR2/> | temperature = {{Val|5488|275|258|fmt=commas}}<ref name=GaiaDR2/> | rotational_velocity = 25.3<ref name=Earle2017/> }} {{Starbox detail|no_heading=y | component1 = Aa2 | mass = 1.29<ref name=msc/> | component2 = Ab | mass2 = 1.82<ref name=msc/> }} {{Starbox catalog | names = {{odlist | BD=+22°2731 | HD=129132 | HIP=71729 | HR=5472 | SAO=83458 | GSC=01483-00948 | WDS=J14404+2159AB }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+129132 }} {{Starbox end}}
'''HD 129132''' is a [[triple star]]<ref name=Barlow1991/> system in the northern [[constellation]] of [[Boötes]]. It is dimly visible to the naked eye with a combined [[apparent visual magnitude]] of 6.13.<ref name=Anderson2012/> The distance to this system is approximately 382 [[light year]]s based on [[Stellar parallax|parallax]], and it is drifting further away from the [[Sun]] with a [[radial velocity]] of +1.7 km/s.<ref name=GaiaDR2/>
This system was found to be a [[spectroscopic binary]] by the [[Dominion Astrophysical Observatory]] in 1923. It was then shown to be a triple star system in 1937 by [[William Edmund Harper|William E. Harper]] and Guy H. Blanchet.<ref name=Harper1937/> The inner pair have an [[orbital period]] of 101.6 days and an [[orbital eccentricity|eccentricity]] of 0.117, with the primary forming the visible component of this pair. The third component forms a visual system with the inner pair, orbiting with a period of {{Convert|3385|days|years|disp=out|abbr=off}} and an eccentricity of 0.073.<ref name=Barlow1991/><ref name=Yu2012/>
The primary component appears to be an aging [[giant star]] with a [[stellar classification]] of F4III,<ref name=cowley1979/> although it has also been classed as a [[G-type main-sequence star]] of type G0V.<ref name=Harlan1970/> It is around a billion years old with twice the [[mass of the Sun]].<ref name=Earle2017/> The star has expanded to 17 times the [[Sun's radius]]<ref name=GaiaDR2/> and is radiating 236 times the [[luminosity of the Sun]]<ref name=GaiaDR2/> at an [[effective temperature]] of 5,488 K.<ref name=GaiaDR2/> It is spinning with a [[projected rotational velocity]] of 25.3 km/s.<ref name=Earle2017/>
== References == {{Reflist|refs=
<ref name=GaiaDR2>{{Cite Gaia DR2|1824277055360974720}}</ref>
<ref name=GaiaDR3>{{Cite Gaia DR3|1824277055360974720}}</ref>
<ref name=SIMBAD>{{cite simbad | title=HD 129132 | access-date=2020-02-03 }}</ref>
<ref name=cowley1979>{{cite journal | last1=Cowley | first1=A. P. | last2=Bidelman | first2=W. P. | title=MK spectral types for some F and G stars | journal=Publications of the Astronomical Society of the Pacific | volume=91 | pages=83–86 | date=February 1979 | doi=10.1086/130446 | bibcode=1979PASP...91...83C | doi-access= }}</ref>
<ref name=Harlan1970>{{cite journal | last1=Harlan | first1=E. A. | last2=Taylor | first2=D. C. | title=MK classifications for F- and G-type stars. II | journal=Astronomical Journal | volume=75 | issue=2 | pages=165–166 | date=March 1970 | bibcode=1970AJ.....75..165H | doi=10.1086/110956 | doi-access= }}</ref>
<ref name=Barlow1991>{{cite journal | title=The Spectroscopic-Speckle Triple System HR 5472 | last1=Barlow | first1=D. J. | last2=Scarfe | first2=C. D. | journal=Astronomical Journal | volume=102 | page=2098 | date=December 1991 | doi=10.1086/116034 | bibcode=1991AJ....102.2098B }}</ref>
<ref name=Anderson2012>{{cite journal | 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 }}</ref>
<ref name=Earle2017>{{cite journal | title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=153 | issue=1 | id=21 | pages=19 | date=January 2017 | bibcode=2017AJ....153...21L | arxiv=1611.02897 | doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free }}</ref>
<ref name=Harper1937>{{cite journal | title=The spectroscopic orbits of H. R. 5472 | last1=Harper | first1=W. E. | last2=Blanchet | first2=G. H. | journal=Publications of the Dominion Observatory Ottawa | volume=7 | page=99-104 | date=July 1937 | bibcode=1937PDAO....7...99H }}</ref>
<ref name=Yu2012>{{cite journal | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S. | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A. | title=Dynamical Masses of a Selected Sample of Orbital Binaries | journal=Astronomy & Astrophysics | volume=546 | id=A69 | pages=5 | date=2012 | doi=10.1051/0004-6361/201219774 | bibcode =2012A&A...546A..69M | doi-access=free }}</ref>
<ref name=msc>{{cite journal |bibcode=2018ApJS..235....6T |title=The Updated Multiple Star Catalog |last1=Tokovinin |first1=Andrei |journal=The Astrophysical Journal Supplement Series |date=2018 |volume=235 |issue=1 |page=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 }}</ref>
}}
{{Stars of Boötes}}
[[Category:G-type main-sequence stars]] [[Category:F-type giants]] [[Category:Spectroscopic binaries]] [[Category:Triple star systems]] [[Category:Boötes]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|129132]] [[Category:Hipparcos objects|071729]] [[Category:Bright Star Catalogue objects|5472]]