{{Short description|Star in the constellation Boötes}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = [[Boötes]]<ref name=Anderson2012/> | ra = {{RA|14|26|27.36529}}<ref name=GaiaDR2/> | dec = {{DEC|+19|13|36.8470}}<ref name=GaiaDR2/> | appmag_v = 5.40<ref name=Anderson2012/> }} {{Starbox character | class = {{nowrap|kA7hA8mF2(III)((Sr II))}}<ref name=gray2001/> | b-v = {{Val|0.231|0.006}}<ref name=Anderson2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|−27.4|0.5}}<ref name=Anderson2012/> | prop_mo_ra = −70.131<ref name=GaiaDR2/> | prop_mo_dec = +26.084<ref name=GaiaDR2/> | parallax = 10.2279 | p_error = 0.1491 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 0.65<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = {{Val|1.99|0.02}}<ref name=Adamczak2014/> | radius = {{Val|4.03|0.23|0.26}}<ref name=GaiaDR2/> | luminosity = {{Val|52.43|0.89}}<ref name=GaiaDR2/> | temperature = {{Val|7528|277|207|fmt=commas}}<ref name=GaiaDR2/> | metal_fe = {{Val|+0.36|0.04}}<ref name=Anderson2012/> | gravity = {{Val|3.13|0.52}}<ref name=Adamczak2014/> | rotation = | rotational_velocity = {{Val|37.74|2.12}}<ref name=Anderson2012/> | age_gyr = }} {{Starbox catalog | names={{odlist | B=f Boo | F=22 Boo | BD=+19°2810 | FK5=1378 | HD=126661 | HIP=70602 | HR=5405 | SAO=101025 | GC=19480 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad=f+Boo }} {{Starbox end}}
'''22 Boötis''' is a single<ref name=Eggleton2008/> [[star]] in the northern [[constellation]] of [[Boötes]],<ref name=SIMBAD/> located 319 [[light year]]s away from the Sun.<ref name=GaiaDR2/> It has the [[Bayer designation]] '''f Boötis'''; ''22 Boötis'' is the [[Flamsteed designation]].<ref name=SIMBAD/> This object is visible to the naked eye as a dim, white-hued star with an [[apparent visual magnitude]] of 5.40.<ref name=Anderson2012/> It is moving closer to the Earth with a heliocentric [[radial velocity]] of −27 km/s.<ref name=Anderson2012/>
This is an [[Am star]]<ref name=Burkhart1980/> with a [[stellar classification]] of kA7 hA8 mF2 (III) ((Sr II)),<ref name=gray2001/> showing the [[calcium K line]] of an A7 star, the [[hydrogen lines]] of an A8 star, and the metal lines of an F2 star. It has the [[luminosity class]] of a [[giant star]] and does not appear to be variable.<ref name=Burkhart1980/> The star has twice<ref name=Adamczak2014/> the [[mass of the Sun]] and four<ref name=GaiaDR2/> times the [[Sun's radius]]. It is spinning with a [[projected rotational velocity]] of 38<ref name=Anderson2012/> km/s. 22 Boötis is radiating 52<ref name=GaiaDR2/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of 7,528 K.<ref name=GaiaDR2/>
==References== <references> <ref name=GaiaDR2>{{cite DR2|1239044708517928064}}</ref>
<ref name=SIMBAD>{{cite simbad | title=f Boo | access-date=May 9, 2019 }}</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=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=Adamczak2014>{{citation | title=Carbon and Oxygen Abundances across the Hertzsprung Gap | last1=Adamczak | first1=Jens | last2=Lambert | first2=David L. | journal=The Astrophysical Journal | volume=791 | issue=1 | id=58 | pages=12 | date=August 2014 | doi=10.1088/0004-637X/791/1/58 | postscript=. | bibcode=2014ApJ...791...58A | arxiv=1407.2157 | s2cid=119104634 }}</ref>
<ref name=gray2001>{{citation | display-authors=1 | last1=Gray | first1=R. O. | last2=Napier | first2=M. G. | last3=Winkler | first3=L. I. | title=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars | journal=The Astronomical Journal | postscript=. | volume=121 | issue=4 | pages=2148 | year=2001 | doi=10.1086/319956 | bibcode=2001AJ....121.2148G | doi-access=free }}</ref>
<ref name=Burkhart1980>{{citation | title=The atmospheric abundances of the giant AM star 22 Bootis | display-authors=1 | last1=Burkhart | first1=C. | last2=vant Veer | first2=C. | last3=Coupry | first3=M. F. | journal=Astronomy and Astrophysics | volume=92 | issue=1–2 | date=December 1980 | pages=132–138 | bibcode=1980A&A....92..132B | postscript=. }}</ref> </references>
==External links== * [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205405 HR 5405] * [http://aladin.u-strasbg.fr/AladinPreview?-c=14+26+27.3644%2B19+13+36.839&ident=*+f+Boo&submit=Aladin+previewer Image 22 Boötis]
{{Stars of Boötes}}
{{DEFAULTSORT:22 Bootis}} [[Category:F-type giants]] [[Category:Am stars]] [[Category:Boötes]] [[Category:Bayer objects|Bootis, f]] [[Category:Durchmusterung objects]] [[Category:Flamsteed objects|Bootis, 22]] [[Category:Henry Draper Catalogue objects|126661]] [[Category:Hipparcos objects|070602]] [[Category:Bright Star Catalogue objects|5405]] [[Category:A-type giants]]