{{Short description|Star in the constellation Boötes}} {{about-distinguish|e Boötis|epsilon Boötis{{!}}ε (epsilon) Boötis}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Boötes constellation map.svg|alt=|float=center|width=250 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=6 Boötis |x=935|y=1070 }} | caption = Location of 6 Boötis (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | constell = [[Boötes]] | ra = {{RA|13|49|42.82223}}<ref name=GaiaDR2/> | dec = {{DEC|+21|15|50.8580}}<ref name=GaiaDR2/> | appmag_v = 4.92<ref name=Anderson2012/> }} {{Starbox character | type = | class = {{nowrap|K4 III<ref name=Yoss1997/> + M8 V<ref name=Griffin1985/>}} | b-v = {{Val|1.432|0.013}}<ref name=Anderson2012/> | variable = }} {{Starbox astrometry | radial_v = {{Val|−3.71|0.48}}<ref name=GaiaDR2/> | prop_mo_ra = +33.773<ref name=GaiaDR2/> | prop_mo_dec = +10.842<ref name=GaiaDR2/> | parallax = 7.1527 | p_error = 0.3659 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = −0.49<ref name=Anderson2012/> }} {{Starbox orbit | reference = <ref name=Griffin1985/> | period_unitless = {{Val|944|8|u=days}} | eccentricity = {{Val|0.41|0.09}} | periastron = {{Val|2444739.5|31.0|ul=JD|fmt=commas}} | periarg = {{Val|359|15}} | k1 = {{Val|1.19|0.15}} }} {{Starbox detail | mass = 5.0<ref name=GaiaDR3/> | luminosity = 382<ref name=fetherolf2023/> | temperature = 4,185<ref name=kordopatis2023/> | radius = 36<ref name=fetherolf2023/> | gravity = 1.49<ref name=kordopatis2023/> | metal_fe = −0.24<ref name=McWilliam1990/> | rotational_velocity = 2.0<ref name=DeMedeiros2002/> | age_gyr = 1.9<ref name=kordopatis2023/> }} {{Starbox catalog | names = {{odlist | B=e&nbsp;Boötis | F=6 Boo | BD=+21°2578 | FK5=3098 | HD=120539 | HIP=67480 | HR=5201 | SAO=83015 | GC=18683 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = 6+Boo }} {{Starbox end}}

'''6 Boötis''' is a [[binary star]]<ref name=Griffin1985/> system in the northern [[constellation]] of [[Boötes]],<ref name=SIMBAD/> located around 460&nbsp;[[light year]]s away from the Sun.<ref name=GaiaDR2/> It has the [[Bayer designation]] '''e Boötis'''; ''6 Boötis'' is the [[Flamsteed designation]].<ref name=SIMBAD/> The system is visible to the naked eye as a faint, orange-hued star with an [[apparent visual magnitude]] of 4.92.<ref name=Anderson2012/> It is moving closer to the Earth with a heliocentric [[radial velocity]] of −3&nbsp;km/s.<ref name=Anderson2012/>

[[File:6 Boötis.jpg|thumb|left|6 Boötis in optical light.]] This is a single-lined [[spectroscopic binary]] system with an [[orbital period]] of {{Convert|944|days|years|abbr=off|disp=out}} and an [[orbital eccentricity|eccentricity]] of 0.4.<ref name=Griffin1985/> The visible component is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K4&nbsp;III.<ref name=Yoss1997/> Its measured [[angular diameter]] is {{Val|2.53|0.12|u=mas}}.<ref name=Richichi2005/> At the estimated distance of the star, this yields a physical size of about 36 times the [[radius of the Sun]].<ref name=fetherolf2023/> The star is radiating 382 times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of {{val|fmt=commas|4185|ul=K}}.<ref name=kordopatis2023/> Its companion is probably a low mass [[red dwarf]] of around class M8&nbsp;V.<ref name=Griffin1985/>

{{clear left}} ==References== <references> <ref name=GaiaDR2>{{cite Gaia DR2|1250169120491310720}}</ref> <ref name=GaiaDR3>{{cite Gaia DR3|1250169120491310720}}</ref>

<ref name=SIMBAD>{{cite simbad | title=6 Boo | access-date=2019-04-23 }}</ref>

<ref name=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | postscript=. | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=Griffin1985>{{citation | title=Spectroscopic binaries near the North Galactic Pole. Paper 12 : 6 Bootis. | last1=Griffin | first1=R. F. | postscript=. | journal=Journal of Astrophysics and Astronomy | volume=6 | pages=77–83 | date=June 1985 | issue=2 | doi=10.1007/BF02715079 | bibcode=1985JApA....6...77G | s2cid=124682374 }}</ref>

<ref name=McWilliam1990>{{citation | last1=McWilliam | first1=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 | date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | doi-access=free }}</ref>

<ref name=DeMedeiros2002>{{citation | title=The Rotation of Binary Systems with Evolved Components | display-authors=1 | last1=De Medeiros | first1=J. R. | last2=Da Silva | first2=J. R. P. | last3=Maia | first3=M. R. G. | journal=The Astrophysical Journal | postscript=. | volume=578 | issue=2 | pages=943–950 | date=October 2002 | doi=10.1086/342613 | bibcode=2002ApJ...578..943D | arxiv=astro-ph/0207288 | s2cid=16196039 }}</ref>

<ref name=Richichi2005>{{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}</ref>

<ref name=Yoss1997>{{citation | title=Radial Velocities and DDO, BV Photometry of Henry Draper G5-M Stars Near the North Galactic Pole | last1=Yoss | first1=K. M. | last2=Griffin | first2=R. F. | journal=Journal of Astrophysics and Astronomy | volume=18 | page=161 | date=September 1997 | issue=2–3 | postscript=. | doi=10.1007/BF02714877 | bibcode=1997JApA...18..161Y | s2cid=123221180 }}</ref>

<ref name=kordopatis2023>{{cite journal |last1=Kordopatis |first1=G. |last2=Schultheis |first2=M. |last3=McMillan |first3=P. J. |last4=Palicio |first4=P. A. |last5=De Laverny |first5=P. |last6=Recio-Blanco |first6=A. |last7=Creevey |first7=O. |last8=Álvarez |first8=M. A. |last9=Andrae |first9=R. |last10=Poggio |first10=E. |last11=Spitoni |first11=E. |last12=Contursi |first12=G. |last13=Zhao |first13=H. |last14=Oreshina-Slezak |first14=I. |last15=Ordenovic |first15=C. |last16=Bijaoui |first16=A. |title=Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3 |journal=Astronomy and Astrophysics |date=2023 |volume=669 |pages=A104 |doi=10.1051/0004-6361/202244283 |arxiv=2206.07937 |bibcode=2023A&A...669A.104K }}</ref>

<ref name=fetherolf2023>{{cite journal |last1=Fetherolf |first1=Tara |last2=Pepper |first2=Joshua |last3=Simpson |first3=Emilie |last4=Kane |first4=Stephen R. |last5=Močnik |first5=Teo |last6=English |first6=John Edward |last7=Antoci |first7=Victoria |last8=Huber |first8=Daniel |last9=Jenkins |first9=Jon M. |last10=Stassun |first10=Keivan |last11=Twicken |first11=Joseph D. |last12=Vanderspek |first12=Roland |last13=Winn |first13=Joshua N. |title=Variability Catalog of Stars Observed during the TESS Prime Mission |journal=The Astrophysical Journal Supplement Series |date=2023 |volume=268 |issue=1 |page=4 |doi=10.3847/1538-4365/acdee5 |doi-access=free |arxiv=2208.11721 |bibcode=2023ApJS..268....4F }}</ref>

</references>

{{Stars of Boötes}}

{{DEFAULTSORT:6 Bootis}} [[Category:K-type giants]] [[Category:M-type main-sequence stars]] [[Category:Spectroscopic binaries]] [[Category:Boötes]] [[Category:Bayer objects|Bootis, e]] [[Category:Durchmusterung objects|BD+21 2578]] [[Category:Flamsteed objects|Bootis, 06]] [[Category:Henry Draper Catalogue objects|120539]] [[Category:Hipparcos objects|067480]] [[Category:Bright Star Catalogue objects|5201]]