{{short description|Star in the constellation Taurus}} {{DISPLAYTITLE:Delta<sup>3</sup> Tauri}} {{other stars by Bayer designation|Delta Tauri{{!}}δ Tauri}} {{Starbox begin | name = δ<sup>3</sup> Tauri }} {{Starbox image | image = 280px | caption=Location of δ<sup>3</sup> Tauri in the Hyades, indicated by its Flamsteed designation 68 }} {{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Taurus | ra = {{RA|04|25|29.38340}}<ref name=vanLeeuwen2007/> | dec = {{DEC|+17|55|40.4579}}<ref name=vanLeeuwen2007/> | appmag_v = {{nowrap|+4.32 (4.35 + 8.37)}}<ref name=Eggleton2008/> }} {{Starbox character | type = main sequence<ref name=zorec2012/> | class = A2IV-Vs<ref name=mk/> | b-v = | u-b = | variable = }} {{Starbox astrometry | radial_v = | prop_mo_ra = +41.91<ref name=vanLeeuwen2007/> | prop_mo_dec = −34.54<ref name=vanLeeuwen2007/> | parallax = 21.96 | p_error = 0.51 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = +1.14<ref name=Eggen1998/> }} {{Starbox detail | source = | mass = {{Val|2.27|0.23}}<ref name=Gebran2010/> | radius = 2.4<ref name=tic/> | luminosity = 29.5<ref name=Gebran2010/> | temperature = 9,025<ref name=Gebran2010/> | gravity = 3.95<ref name=Gebran2010/> | metal_fe = +0.32<ref name=gaspar2016/> | rotational_velocity = 11.3<ref name=Gebran2010/> | rotation = 2.13<ref name=bychkov2005/> days | age_myr = 630<ref name=dr2014/> }} {{Starbox catalog | names = {{odlist | name=Cleeia | B=δ<sup>3</sup> Tau | F=68 Tauri | BD=+17°719 | FK5= | HD=27962 | HIP=20648 | HR=1389 | SAO=93923 | ADS=3206 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = del03+Tau }} {{Starbox end}} '''Delta<sup>3</sup> Tauri''' ('''δ<sup>3</sup> Tauri''') is a binary star<ref name=Eggleton2008/> system in the zodiac constellation of Taurus. Based upon an annual parallax shift of 21.96 mas as seen from Earth,<ref name=vanLeeuwen2007/> it is located roughly 149 light years distant from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of +4.32.<ref name=Eggleton2008/> δ<sup>3</sup> Tauri is separated from δ<sup>1</sup> Tauri by 0.72° on the sky.<ref name=SIMBAD/> Some modern astronomy books give this star the name '''Cleeia''',<ref name=Falkner2011/><ref name=Bagnall2012/> from the Greek '''Kleeia''' (transliteration of Κλεεια),<ref name=Theoi/> who was one of the Hyades sisters. It is considered a member of the Hyades cluster.<ref name=Gebran2010/>
In Chinese, {{lang|zh|畢宿}} ({{lang|zh-Latn|Bì Xiù}}), meaning ''Net'', refers to an asterism consisting δ<sup>3</sup> Tauri, ε Tauri, δ<sup>1</sup> Tauri, γ Tauri, Aldebaran, 71 Tauri and λ Tauri.<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 name for δ<sup>3</sup> Tauri itself is {{lang|zh|畢宿二}} ({{lang|zh-Latn|Bì Xiù èr}}), "the Second Star of Net".<ref>{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20081025110153/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm |date=2008-10-25 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref>
The magnitude 4.35<ref name=Eggleton2008/> primary, component A, appears to be an A-type star intermediate between main sequence and subgiant, with a stellar classification of A2 IV-Vs. The "s" indicates sharp (unusually narrow) absorption lines, a sign of slow rotation. It is a candidate blue straggler and shows characteristics of an Am star. Abt (1985) gave it a classification of A2kA3hA5m, indicating that the spectrum displays the calcium K-line of an A2 star, the hydrogen lines of an A3 star and the metal lines of an A5 star. It is deficient in scandium but has enhanced iron peak and heavy elements.<ref name=Gebran2010/> Although suspected of variability in the past,<ref name=Kholopov1981/> Delta<sup>3</sup> Tauri A was subsequently determined to be photometrically constant.<ref name=Adelman1997/>
The companion, component B, is a magnitude 8.37<ref name=Eggleton2008/> star at an angular separation of 1.80 arc seconds along a position angle of 341°, as of 2010. At 77 arcseconds away (as of 2006) is a magnitude 11.12 visual companion, designated component C.<ref name=WDSC2014/>
==References== <references> <ref name=bychkov2005>{{citation |postscript=. |bibcode=2005A&A...430.1143B |title=A catalog of stellar magnetic rotational phase curves |last1=Bychkov |first1=V. D. |last2=Bychkova |first2=L. V. |last3=Madej |first3=J. |journal=Astronomy and Astrophysics |date=2005 |volume=430 |issue=3 |page=1143 |doi=10.1051/0004-6361:20034563 }}</ref>
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<ref name=SIMBAD>{{cite simbad | title=del03 Tau | access-date=2017-08-07 | mode=cs2 | postscript=. }}</ref>
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</references>
{{Stars of Taurus|state=collapsed}}
Category:A-type subgiants Category:Am stars Category:Binary stars Category:Hyades (star cluster) Tauri, Delta Category:Taurus (constellation) Cleeia BD+17 0719 Tauri, 068 027962 020648 1389 Category:A-type main-sequence stars