{{Short description|Star in the constellation Boötes}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = Boötes | ra = {{RA|13|53|12.93033}}<ref name=GaiaDR2/> | dec = {{DEC|+17|55|58.3282}}<ref name=GaiaDR2/> | appmag_v = 5.71<ref name=Auriere2015/> }} {{Starbox character | type = subgiant<ref name=Auriere2015/> | class = G5 III<ref name=Auriere2015/> | b-v = 0.845<ref name=Anderson2012/> | u-b = }} {{Starbox astrometry | radial_v = {{Val|−11.00|0.18}}<ref name=GaiaDR2/> | prop_mo_ra = −34.842<ref name=GaiaDR2/> | prop_mo_dec = +5.092<ref name=GaiaDR2/> | parallax = 5.5236 | p_error = 0.0776 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = }} {{Starbox detail | source = <ref name=Auriere2015/> | mass = {{Val|4.0|0.7}} | radius = 19.0 | luminosity = 229 | temperature = 4,600 | metal_fe = +0.08 | gravity = | rotational_velocity = 14.5 | age_gyr = }} {{Starbox catalog | names = {{odlist | F=7 Boo | BD=+18°2795 | FK5= | HD=121107 | HIP=67787 | HR=5225 | SAO=100751 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = 7+Boo }} {{Starbox end}}
'''7 Boötis''' is a single<ref name=Eggleton2008/> star in the northern constellation of Boötes,<ref name=SIMBAD/> located 590 light-years away from the Sun.<ref name=GaiaDR2/> It is barely visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.71.<ref name=Auriere2015/> 7 Boötis is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.<ref name=GaiaDR2/>
This is an evolved subgiant star with a stellar classification of G5 III, currently at the end of the Hertzsprung gap. It has a weak level of magnetic activity but a fairly strong X-ray luminosity of {{Val|3.72e20|u=erg s<sup>−1</sup>}}. The rotation rate is moderate, with a projected rotational velocity of 14.5 km/s. It has four times the mass of the Sun and has expanded to 19 times the Sun's radius. The star is radiating 229 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,600 K.<ref name=Auriere2015/>
==References== <references> <ref name=SIMBAD>{{cite simbad | title=7 Boo | access-date=September 13, 2018 }}</ref>
<ref name=GaiaDR2>{{cite DR2}}</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=Auriere2015>{{citation | display-authors=1 | title=The magnetic fields at the surface of active single G-K giants | last1=Aurière | first1=M. | last2=Konstantinova-Antova | first2=R. | last3=Charbonnel | first3=C. | last4=Wade | first4=G. A. | last5=Tsvetkova | first5=S. | last6=Petit | first6=P. | last7=Dintrans | first7=B. | last8=Drake | first8=N. A. | last9=Decressin | first9=T. | last10=Lagarde | first10=N. | last11=Donati | first11=J. F. | last12=Roudier | first12=T. | last13=Lignières | first13=F. | last14=Schröder | first14=K. P. | last15=Landstreet | first15=J. D. | last16=Lèbre | first16=A. | last17=Weiss | first17=W. W. | last18=Zahn | first18=J. P. | journal=Astronomy & Astrophysics | arxiv=1411.6230 | volume=574 | id=A90 | pages=30 | date=February 2015 | postscript=. | doi=10.1051/0004-6361/201424579 | bibcode=2015A&A...574A..90A | s2cid=118504829 }}</ref>
<ref name=Eggleton2008>{{citation | 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 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref> </references>
{{Stars of Boötes}}
{{DEFAULTSORT:7 Bootis}} Category:G-type subgiants Category:Boötes Category:Durchmusterung objects Bootis, 07 121107 067787 5225