:22 Boötis
{{Short description|Star in the constellation Boötes}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Boötes
| dec = {{DEC|+19|13|36.8470}}
}}
{{Starbox character
| class = {{nowrap|kA7hA8mF2(III)((Sr II))}}
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−27.4|0.5}}
| parallax = 10.2279
| p_error = 0.1491
}}
{{Starbox detail
| source =
| radius = {{Val|4.03|0.23|0.26}}
| luminosity = {{Val|52.43|0.89}}
| temperature = {{Val|7528|277|207|fmt=commas}}
| metal_fe = {{Val|+0.36|0.04}}
| rotation =
| rotational_velocity = {{Val|37.74|2.12}}
| 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 }}
}}
{{Starbox reference
| Simbad=f+Boo
}}
{{Starbox end}}
22 Boötis is a single star in the northern constellation of Boötes, located 319 light years away from the Sun. It has the Bayer designation f Boötis; 22 Boötis is the Flamsteed designation. This object is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.40. It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s.
This is an Am star with a stellar classification of kA7 hA8 mF2 (III) ((Sr II)), 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. The star has twice the mass of the Sun and four times the Sun's radius. It is spinning with a projected rotational velocity of 38 km/s. 22 Boötis is radiating 52 times the Sun's luminosity from its photosphere at an effective temperature of 7,528 K.
References
{{reflist|refs=
{{cite DR2|1239044708517928064}}
{{cite simbad | title=f Boo | access-date=May 9, 2019 }}
| 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 }}
| 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 }}
| 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 }}
| 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 }}
| 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=. }}
}}
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}}