Delta Sagittarii
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Delta Sagittarii (δ Sagittarii, abbreviated Delta Sgr, δ Sgr), formally named Kaus Media Template:IPAc-en,[1][2] is a star in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of this star is +2.70,[3] making it easily visible to the naked eye. Parallax measurements place the distance at roughly Template:Convert from the Sun.[4]
Properties
Eggleton and Tokovinin (2008) list Delta Sagittarii as a binary star system consisting of an evolved K-type giant star with a stellar classification of K3 III,[5] and a white dwarf companion.[6] The giant has an estimated mass three times that of the Sun, and is most likely fusing helium to carbon in its core.[7] It is a weak barium star, most likely having had its surface abundance of s-process elements enhanced through mass transfer from an orbiting companion, presumed to be a white dwarf.[8] It has an estimated 3.21 times the mass of the Sun and is about 260Template:Nbspmillion years old.[9]
Delta Sagittarii has three dim visual companions:[10]
- a 14th magnitude star at a separation of 26 arcseconds,
- a 15th magnitude star at a separation of 40 arcseconds, and
- a 13th magnitude star at a separation of 58 arcseconds from the primary.
Nomenclature
δ Sagittarii (Latinised to Delta Sagittarii) is the star's Bayer designation.
It bore the traditional names Kaus Media, Kaus Meridionalis, and Media, which derive from the Template:Langx Template:Lang ('bow') and Template:Langx ('middle'). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[11] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[12] included a table of the first two batches of names approved by the WGSN; which included Kaus Media for this star.
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Template:Lang, meaning 'second of Warida'.[13]
In Chinese astronomy, Template:Lang Template:Lang ('Winnowing Basket') refers to an asterism consisting of Delta Sagittarii, Gamma2 Sagittarii, Epsilon Sagittarii and Eta Sagittarii. Consequently, the Chinese name for Delta Sagittarii itself is Template:Lang Template:Lang ('the Second Star of Winnowing Basket').[14]
This star, together with Gamma Sagittarii, Epsilon Sagittarii, Zeta Sagittarii, Lambda Sagittarii, Sigma Sagittarii, Tau Sagittarii and Phi Sagittarii, comprises the Teapot asterism.[15]
In Hindu astrology, this star is also called Template:Lang.
Notes
References
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