Editing Delta Arietis

{{Short description|Star in the constellation Aries}}
{{Starbox begin
 | name = Delta Arietis
}}
{{Starbox image
 | image=
{{Location mark
|image=Aries constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=δ Arietis
|x=324|y=474
}}
|caption=Location of δ Arietis (circled)
}}
{{Starbox observe
 | epoch       = J2000
 | ra          = {{RA|03|11|37.767}}<ref name=Gaia_DR3/>
 | dec         = {{DEC|+19|43|36.02}}<ref name=Gaia_DR3/>
 | appmag_v    = 4.349<ref name=mnras172_667/>
 | constell    = [[Aries (constellation)|Aries]]<ref name=Anderson2012/>
}}
{{Starbox character
 | class       = K2&nbsp;III<ref name=aaa454_3_943/>
 | r-i         = 0.51
 | v-r         =
 | b-v         = +1.035<ref name=mnras172_667/>
 | u-b         = +0.914<ref name=mnras172_667/>
 | variable    = Suspected<ref name=gcvs/>
}}
{{Starbox astrometry
 | radial_v    = +23.05{{±|0.20}}<ref name=aaa454_3_943/>
 | prop_mo_ra  = +153.871
 | prop_mo_dec = –5.586
 | pm_footnote = <ref name=Gaia_DR3/>
 | parallax    = 19.7731
 | p_error     = 0.1592
 | parallax_footnote = <ref name=Gaia_DR3/>
 | absmag_v    = +0.77<ref name=Anderson2012/>
}}
{{Starbox detail
 | mass        = 1.91<ref name=aaa454_3_943/>
 | radius      = 10.42{{±|0.97}}<ref name=aaa526_A100/>
 | luminosity  = 45{{±|6}}<ref name=aaa526_A100/>
 | temperature = 4,810<ref name=aaa526_A100/>
 | gravity     = 2.93<ref name=aaa526_A100/>
 | metal_fe    = –0.03<ref name=aaa526_A100/>
 | rotational_velocity = 4.3<ref name=aj135_1_209/>
 | age_myr     = 
}}
{{Starbox catalog
 | names = {{odlist | name=Botein, Botejn | B=δ Arietis | F=57 Arietis | BD=+19°477 | FK5=114 | HD=19787 | HIP=14838 | HR=951 | SAO=93328 | GC=3805 | PPM=118897 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = del+Ari
}}
{{Starbox end}}

'''Delta Arietis''' is a [[star]] in the [[Northern celestial hemisphere|northern]] [[constellation]] of [[Aries (constellation)|Aries]], positioned 1.8 degrees north of the [[ecliptic]]. Its identifier is a [[Bayer designation]] that is [[Romanization of Greek|Latinized]] from '''δ Arietis''', and abbreviated '''Delta Ari''' or '''δ Ari'''. This star is officially named '''Botein''', pronounced {{IPAc-en|ˈ|b|oʊ|t|iː|n}}.<ref name="IAU-LSN"/> The [[apparent visual magnitude]] of Delta Arietis is 4.35,<ref name=mnras172_667/> so it is visible to the [[naked eye]]. It has an annual [[stellar parallax|parallax]] shift of {{val|19.77|ul=mas}};<ref name=Gaia_DR3/> corresponding to a distance of about {{cvt|165|ly|pc|lk=on}} from the [[Sun]]. This star is receding from the Sun with a [[radial velocity]] of +23&nbsp;km/s.<ref name=aaa454_3_943/>

==Nomenclature==
''δ Arietis'' ([[Latinisation of names|Latinised]] to ''Delta Arietis'') is the star's [[Bayer designation]].

It bore the traditional name ''Botein'' which is derived from Al Bīrūnī's ''Al Buṭayn'' ([[Arabic]]: البُطَين), the diminutive of ''Al Baṭn'', "the Belly". This is the name of a star association consisting of this star, [[Epsilon Arietis]], [[Zeta Arietis]], [[Pi Arietis]], and [[Rho3 Arietis|Rho<sup>3</sup>&nbsp;Arietis]]<ref name=allen1963/> According to a 1971 [[NASA]] catalogue of stars, ''Al Buṭain'' was the title for five stars: Delta Arietis (listed as ''Botein''), Pi Arietis (as ''Al Buṭain I''), Rho3 Arietis (''Al Buṭain II''), Epsilon Arietis (''Al Buṭain III'') and Zeta Arietis (''Al Buṭain IV'').<ref name=Rhoads_1971/> In 2016, the [[International Astronomical Union]] organized a [[Working Group on Star Names]] (WGSN)<ref name="WGSN"/> to catalogue and standardize proper names for stars. The WGSN approved the name ''Botein'' for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>

In the catalogue of stars in the ''Calendarium of Al Achsasi Al Mouakket'', this star was designated ''Nir al Botain'', which was translated into [[Latin]] as ''Lucida Ventris'', meaning "the brightest of the belly".<ref name=Knobel_1895/>

In [[Chinese astronomy|Chinese]], {{lang|zh|天陰}} ({{lang|zh-Latn|Tiān Yīn}}), meaning ''[[Hairy Head (Chinese constellation)|Yin Force]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of Delta Arietis, [[63 Arietis]], Zeta Arietis, [[Tau Arietis (disambiguation)|Tau Arietis]]<!--intentional link to DAB page--> and [[65 Arietis]].<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, the [[Chinese star names|Chinese name]] for Delta Arietis itself is {{lang|zh|天陰四}} ({{lang|zh-Latn|Lóu Su sì}}, {{langx|en|the Fourth Star of Yin Force}}.)<ref>{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ama_b.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20100811014924/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ama_b.htm |date=2010-08-11 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref>

==Properties==
Delta Arietis is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K2&nbsp;III.<ref name=aaa454_3_943/> It belongs to a population known as [[red clump]] giants, which means it is generating energy through the fusion of helium at its core.<ref name=mnras408_2_1225/> With close to twice the [[mass of the Sun]],<ref name=aaa454_3_943/> the [[Stellar atmosphere|outer envelope]] has expanded until it is around ten<ref name=aaa526_A100/> times the [[Sun's radius]]. It shines with 45<ref name=aaa526_A100/> times the [[Sun's luminosity]] at an [[effective temperature]] of 4,810&nbsp;K,<ref name=aaa526_A100/> giving it the orange-hued glow of a [[K-type star]].<ref name=csiro/> It is a suspected [[variable star]] that ranges in magnitude from 4.33 to 4.37.<ref name=gcvs/>

==References==
{{reflist|refs=

<ref name=Gaia_DR3>{{cite Gaia DR3|60248877811546112}}</ref>

<ref name=Anderson2012>{{citation
 | 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=. }}</ref>

<ref name=aaa526_A100>{{citation | display-authors=1 | last1=Piau | first1=L. | last2=Kervella | first2=P. | last3=Dib | first3=S. | last4=Hauschildt | first4=P. | title=Surface convection and red-giant radius measurements | journal=Astronomy and Astrophysics | volume=526 | page=A100 |date=February 2011 | doi=10.1051/0004-6361/201014442 | bibcode=2011A&A...526A.100P | arxiv=1010.3649 | s2cid=118533297 | postscript=. }}</ref>

<ref name=aaa454_3_943>{{citation | display-authors=1 | last1=Hekker | first1=S. | last2=Reffert | first2=S. | last3=Quirrenbach | first3=A. | last4=Mitchell | first4=D. S. | last5=Fischer | first5=D. A. | last6=Marcy | first6=G. W. | last7=Butler | first7=R. P. | title=Precise radial velocities of giant stars. I. Stable stars | journal=Astronomy and Astrophysics | volume=454 | issue=3 | pages=943–949 |date=August 2006 | doi=10.1051/0004-6361:20064946 | bibcode=2006A&A...454..943H | arxiv=astro-ph/0604502 | s2cid=119529768 | postscript=. }}</ref>

<ref name=allen1963>{{citation | last=Allen | first=R. H. | year=1963 | author-link=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/83 | access-date=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York | isbn=((0-486-21079-0)) | page=[https://archive.org/details/starnamestheirlo00alle/page/83 83] | url-access=registration }}</ref>

<ref name=aj135_1_209>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | s2cid=121883397 | postscript=. | doi-access=free }}</ref>

<ref name=mnras172_667>{{citation | last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L. | title=A new photometric metal abundance and luminosity calibration for field G and K giants. | journal=Monthly Notices of the Royal Astronomical Society | volume=172 | pages=667–679 |date=September 1975 | issue=3 | bibcode=1975MNRAS.172..667J | postscript=. | doi = 10.1093/mnras/172.3.667 | doi-access=free }}</ref>

<ref name=mnras408_2_1225>{{citation | display-authors=1 | last1=Puzeras | first1=E. | last2=Tautvaišienė | first2=G. | last3=Cohen | first3=J. G. | last4=Gray | first4=D. F. | last5=Adelman | first5=S. J. | last6=Ilyin | first6=I. | last7=Chorniy | first7=Y. | title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements | journal=Monthly Notices of the Royal Astronomical Society | volume=408 | issue=2 | pages=1225–1232 |date=October 2010	 | doi=10.1111/j.1365-2966.2010.17195.x | doi-access=free | bibcode=2010MNRAS.408.1225P | arxiv=1006.3857 | s2cid=44228180 | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad | title=del Ari | access-date=2012-08-04 }}</ref>

<ref name=csiro>{{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=[[Commonwealth Scientific and Industrial Research Organisation]] |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-01-16 |url-status=dead |archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=2012-03-18 }}</ref>

<ref name=gcvs>{{citation
 | title=NSV 01066
 | display-authors=1 | last1=Samus | first1=N. N.
 | last2=Durlevich | first2=O. V. | last3=Kazarovets | first3=R. V.
 | work=[[General Catalogue of Variable Stars]]
 | url=http://www.sai.msu.su/gcvs/cgi-bin/ident.cgi?cat=HD++&num=19787
 | access-date=2012-08-04 | postscript=. }}</ref>

<ref name="IAU-LSN">{{citation | postscript=.
 | title=Naming Stars | publisher=IAU.org
 | url=https://www.iau.org/public/themes/naming_stars/
 | access-date=16 December 2017}}</ref>

<ref name=Knobel_1895>{{citation | postscript=.
 | title=Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket
 | last=Knobel | first=E. B.
 | journal=[[Monthly Notices of the Royal Astronomical Society]]
 | volume=55 | pages=429–438 | date=June 1895
 | doi=10.1093/mnras/55.8.429| doi-access=free
 | bibcode=1895MNRAS..55..429K }}</ref>

<ref name=Rhoads_1971>{{citation | postscript=.
 | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars
 | first=Jack W. | last=Rhoads
 | publisher=Jet Propulsion Laboratory, California Institute of Technology
 | date=November 15, 1971
 | url=https://ntrs.nasa.gov/citations/19720005197 | access-date=2025-05-03 }}</ref>

<ref name="WGSN">{{citation
 | title=IAU Working Group on Star Names (WGSN)
 | publisher=[[International Astronomical Union]]
 | url=https://www.iau.org/science/scientific_bodies/working_groups/280/
 | access-date=22 May 2016 | postscript=. }}</ref>

}}

==External links==
* [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20951 HR 951]
* [https://web.archive.org/web/20080926185552/http://www.purplehell.com/riddletools/stars.htm The Constellations and Named Stars]
* [http://aladin.u-strasbg.fr/AladinPreview?-c=03+11+37.7655%2B19+43+36.039&ident=NSV++1066&submit=Aladin+previewer Image Delta Arietis]

{{Stars of Aries}}

{{Authority control}}

{{DEFAULTSORT:Delta Arietis}}
[[Category:Aries (constellation)]]
[[Category:K-type giants]]
[[Category:Horizontal-branch stars]]
[[Category:Stars with proper names|Botein]]
[[Category:Bayer objects|Arietis, Delta]]
[[Category:Flamsteed objects|Arietis, 57]]
[[Category:Bright Star Catalogue objects|0951]]
[[Category:Henry Draper Catalogue objects|019787]]
[[Category:Durchmusterung objects|BD+19 0477]]
[[Category:Hipparcos objects|014838]]