zeta Leonis
{{short description|Binary star system in the constellation Leo}}
{{Starbox begin}}
{{Starbox image
| image=
{{Location mark
|image=Leo constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=ζ Leonis
|x=698|y=288
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|caption=Location of ζ Leonis (circled)
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{{Starbox observe
| epoch = J2000
| dec = {{DEC|+23|25|02.3221}}
| constell = Leo
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{{Starbox character
| variable = Suspected
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{{Starbox astrometry
| parallax = 11.90
| p_error = 0.18
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| age =
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{{Starbox catalog
| names = Adhafera, Aldhafera, Adhafara, ζ Leo, 36 Leo, BD+24°2209, FK5 384, HD 89025, HIP 50335, HR 4031, SAO 81265, GC 14107, NSV 04804, WDS 10167+2325A
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{{Starbox reference
| Simbad=HD+89025
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Zeta Leonis (ζ Leonis, abbreviated Zeta Leo, ζ Leo), also named Adhafera {{IPAc-en|æ|d|@|'|f|ɪər|@}},{{cite web | url=https://www.iau.org/public/themes/naming_stars/#n4 | title=List of IAU-approved Star Names |access-date=24 January 2022}} is a third-magnitude star in the constellation of Leo, the lion. It forms the second star (after Gamma Leonis) in the blade of the sickle, which is an asterism formed from the head of Leo.
Nomenclature
ζ Leonis (Latinised to Zeta Leonis) is the star's Bayer designation. It has the traditional name Adhafera (Aldhafera, Adhafara), which comes from the Arabic الضفيرة aḍ-ḍafīrah 'the braid/curl', a reference to its position in the lion's mane.{{cn|date=January 2020}} In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN){{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}} to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 1 |access-date=28 July 2016}} included a table of the first two batches of names approved by the WGSN; which included Adhafera for this star.
Properties
Adhafera is a giant star with a stellar classification of F0 III. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. Its apparent magnitude is +3.44, making it relatively faint for a star that is visible to the naked eye. Nevertheless, it shines with 220 times the luminosity of the Sun. Adhafera has about three times the Sun's mass and 10.5 times the radius of the Sun. Parallax measurements from the Hipparcos satellite yield an estimated distance to Adhafera of {{Convert|274|ly|pc|abbr=off|lk=on}} from the Sun.
Adhafera forms a double star with an optical companion that has an apparent magnitude of 5.90. Known as 35 Leonis, this star is separated from Adhafera by 325.9 arcseconds along a position angle of 340°. The two stars do not form a binary star system as 35 Leo is only 100 light years from Earth, thus separating the two stars by approximately {{Convert|174|ly|pc|abbr=off|lk=on}}.
References
{{reflist|refs=
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
{{citation | display-authors=1 | last1=Montes | first1=D. | last2=López-Santiago | first2=J. | last3=Gálvez | first3=M. C. | last4=Fernández-Figueroa | first4=M. J. | last5=De Castro | first5=E. | last6=Cornide | first6=M. | title=Late-type members of young stellar kinematic groups - I. Single stars | journal=Monthly Notices of the Royal Astronomical Society | volume=328 | issue=1 | pages=45–63 | date=November 2001 | doi=10.1046/j.1365-8711.2001.04781.x | doi-access=free | bibcode=2001MNRAS.328...45M | arxiv=astro-ph/0106537 | s2cid=55727428 }}
{{citation |last1=McDonald |first1=I. |last2=Zijlstra |first2=A. A. |last3=Watson |first3=R. A. |date=2017-10-01 |title=Fundamental parameters and infrared excesses of Tycho-Gaia stars |journal=Monthly Notices of the Royal Astronomical Society |volume=471 |issue=1 |pages=770–791 |doi=10.1093/mnras/stx1433 |doi-access=free |issn=0035-8711|arxiv=1706.02208 }} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/471/770&RAJ2000=154.172571 Zeta Leonis' database entry] at VizieR.
{{citation | title=CCDM (Catalog of Components of Double & Multiple stars (Dommanget+ 2002) | work=VizieR | publisher=Centre de Données astronomiques de Strasbourg | url=http://vizier.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J10166%2b2327A | access-date=2010-05-12 }}
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{{Stars of Leo}}
{{DEFAULTSORT:Zeta Leonis}}