{{Short description|Single star in the constellation Boötes}} {{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=45 Boötis |x=295|y=965 }} | caption = Location of 45 Boötis (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Boötes (constellation)|Boötes]] | ra = {{RA|15|07|18.06587}}<ref name=GaiaDR2/> | dec = {{DEC|+24|52|09.0952}}<ref name=GaiaDR2/> | appmag_v = 4.93<ref name=Valenti2005/> }} {{Starbox character | type = | class = F5 V<ref name=Malagnini1990/> | b-v = +0.43<ref name=Malagnini1990/> | variable = }} {{Starbox astrometry | radial_v = −11.2<ref name=Valenti2005/> | prop_mo_ra = +184.767<ref name=GaiaDR2/> | prop_mo_dec = −164.012<ref name=GaiaDR2/> | parallax = 51.6674 | p_error = 0.1882 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 3.96<ref name=Eggen1998/> }} {{Starbox detail | source = <ref name=Valenti2005/> | mass = {{Val|1.21|0.16}} | radius = {{Val|1.461|0.027}} | luminosity = {{Val|3.30|0.25|0.22}} | temperature = 6,435 | metal_fe = −0.02 | gravity = 4.19 | rotational_velocity = 39.8 | age_gyr = {{Val|1.6|0.8|0.6}} }} {{Starbox catalog | names = {{odlist | B=c Boo | F=45 Boo | V=NSV 6945 | BD=+25°2873 | FK5=1396 | GJ=578 | HD=134083 | HIP=73996 | HR=5634 | SAO=83671 | WDS=J15073+2452 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad=HD+134083 }} {{Starbox end}}
'''45 Boötis''' is a single<ref name=Fuhrmann2017/><ref name=Eggleton2008/> [[star]] located 63 [[light year]]s away from the Sun in the northern [[constellation]] of [[Boötes]]. It has the [[Bayer designation]] '''c Boötis'''; ''45 Boötis'' is the [[Flamsteed designation]]. This body is visible to the naked eye as a faint, yellow-white hued star with an [[apparent visual magnitude]] of 4.93.<ref name=Valenti2005/> It has a relatively high [[proper motion]], traversing the [[celestial sphere]] at the rate of {{Val|0.247|ul=arcsecond}} per year.<ref name=Lepine2005/> The star is moving closer to the Earth with a heliocentric [[radial velocity]] of −11 km/s,<ref name=Valenti2005/> and is a stream member of the [[Ursa Major Moving Group]].<ref name=king2003/>
This is an [[F-type main-sequence star]] with a [[stellar classification]] of F5 V.<ref name=Malagnini1990/> It is around 1.6 billion years old and is spinning with a [[projected rotational velocity]] of 40 km/s. The star has 1.2 times the [[mass of the Sun]] and 1.46 times the [[Sun's radius]]. It is radiating 3.3 times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 6,435 K.<ref name=Valenti2005/> 45 Boötis is a source of [[X-ray astronomy|X-ray emission]].<ref name=Haakonsen2009/>
There is a magnitude 11.53 [[visual companion]] at an [[angular separation]] of {{Val|103.50|ul=arcsecond}} along a position angle (PA) of 40°, as of 2012. A magnitude 10.23 star can be found at a separation of {{Val|247.90|u=arcsecond}} with a PA of 358°, as of 2015.<ref name=WDSC2014/>
==References== <references> <ref name=GaiaDR2>{{cite DR2|1264630412816366720}}</ref>
<ref name=SIMBAD>{{cite simbad | title=40 Boo | access-date=May 12, 2019 }}</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>
<ref name=Malagnini1990>{{citation | last1=Malagnini | first1=M. L. | last2=Morossi | first2=C. | title=Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars | journal=Astronomy and Astrophysics Supplement Series | volume=85 | issue=3 | pages=1015–1019 | date=November 1990 | bibcode=1990A&AS...85.1015M }}</ref>
<ref name=Valenti2005>{{citation | last1=Valenti | first1=J. A. | last2=Fischer | first2=D. A. | title=Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs | journal=The Astrophysical Journal Supplement Series | volume=159 | pages=141–166 | date=2005 | issue=1 | postscript=. | bibcode=2005ApJS..159..141V | doi=10.1086/430500 | doi-access=free }}</ref>
<ref name=Fuhrmann2017>{{citation | last1=Fuhrmann | first1=K. | last2=Chini | first2=R. | last3=Kaderhandt | first3=L. | last4=Chen | first4=Z. | title=Multiplicity among Solar-type Stars | display-authors=1 | journal=The Astrophysical Journal | volume=836 | issue=1 | pages=139 | year=2017 | bibcode=2017ApJ...836..139F | postscript=. | doi=10.3847/1538-4357/836/1/139| doi-access=free }}</ref>
<ref name=king2003>{{citation | display-authors=1 | last1=King | first1=Jeremy R. | last2=Villarreal | first2=Adam R. | last3=Soderblom | first3=David R. | last4=Gulliver | first4=Austin F. | last5=Adelman | first5=Saul J. | title=Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group | journal=The Astronomical Journal | postscript=. | volume=125 | issue=4 | pages=1980 | year=2003 | bibcode=2003AJ....125.1980K | doi=10.1086/368241 | url=https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1248&context=physastro_pubs | doi-access=free | url-access=subscription }}</ref>
<ref name=Eggen1998>{{citation | title=The Sirius Supercluster and Missing Mass near the Sun | last1=Eggen | first1=Olin J. | journal=The Astronomical Journal | postscript=. | volume=116 | issue=2 | pages=782–788 | date=August 1998 | doi=10.1086/300465 | bibcode=1998AJ....116..782E | doi-access= }}</ref>
<ref name=Lepine2005>{{citation | last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M. | title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog) | journal=The Astronomical Journal | volume=129 | issue=3 | pages=1483–1522 | date=March 2005 | doi=10.1086/427854 | bibcode=2005AJ....129.1483L | arxiv=astro-ph/0412070 | s2cid=2603568 | postscript=. }}</ref>
<ref name=Haakonsen2009>{{citation | last1=Haakonsen | first1=Christian Bernt | last2=Rutledge | first2=Robert E. | title=XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources | journal=The Astrophysical Journal Supplement | volume=184 | issue=1 | pages=138–151 | date=September 2009 | doi=10.1088/0067-0049/184/1/138 | bibcode=2009ApJS..184..138H | arxiv=0910.3229 | s2cid=119267456 | postscript=. }}</ref>
<ref name=WDSC2014>{{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | postscript=. | doi-access=free }}</ref> </references>
==External links== * [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205634 HR 5634] * [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J15074%2b2453A CCDM J15074+2453] * [http://aladin.u-strasbg.fr/AladinPreview?-c=15+07+18.0659%2B24+52+09.104&ident=NSV++6945&submit=Aladin+previewer Image 45 Boötis]
{{Stars of Boötes}}
{{DEFAULTSORT:45 Bootis}} [[Category:F-type main-sequence stars]] [[Category:Ursa Major moving group]] [[Category:Double stars]] [[Category:Boötes]] [[Category:Bayer objects|Bootis, c]] [[Category:Durchmusterung objects|BD+25 2873]] [[Category:Flamsteed objects|Bootis, 45]] [[Category:Gliese and GJ objects|0578]] [[Category:Henry Draper Catalogue objects|134083]] [[Category:Hipparcos objects|073996]] [[Category:Bright Star Catalogue objects|5634]]