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Delta Arietis is a star in the northern constellation of Aries, positioned 1.8 degrees north of the ecliptic. Its identifier is a Bayer designation that is Latinized from δ Arietis, and abbreviated Delta Ari or δ Ari. This star is officially named Botein, pronounced Template:IPAc-en.<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 parallax shift of Template:Val;<ref name=Gaia_DR3/> corresponding to a distance of about Template:Cvt from the Sun. This star is receding from the Sun with a radial velocity of +23 km/s.<ref name=aaa454_3_943/>
NomenclatureEdit
δ Arietis (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<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, {{#invoke:Lang|lang}} ({{#invoke:Lang|lang}}), meaning Yin Force, refers to an asterism consisting of Delta Arietis, 63 Arietis, Zeta Arietis, Tau Arietis and 65 Arietis.<ref>Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.</ref> Consequently, the Chinese name for Delta Arietis itself is {{#invoke:Lang|lang}} ({{#invoke:Lang|lang}}, Template:Langx.)<ref>Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref>
PropertiesEdit
Delta Arietis is an evolved giant star with a stellar classification of K2 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 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 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/>