Mu Boötis
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Mu Boötis is a binary star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from μ Boötis, and abbreviated Mu Boo or μ Boo. This system had the traditional name Alkalurops, pronounced Template:IPAc-en.[8] Based on parallax measurements, these stars are located at a distance of 123 light-years.
It makes an optical double with Mu2 Boötis, 109" away, which is an unrelated star system passing close to Mu Boötis.
Properties
The components of the system have an angular separation of Script error: No such module "val"..[9] They form a spectroscopic binary system with an orbital period of 3.75 years.[3] The visible component is a yellow-white F-type subgiant with an apparent magnitude of +4.31.
Additional components
More far away there is μ2 Boötis, a double star whose components are separated by Script error: No such module "val"..[9] It is a probable binary star system with an apparent magnitude of +6.51. Their spectral classification of G1V matches a G-type main-sequence star. The components of μ2 Boötis have apparent magnitudes of +7.2 and +7.8.Script error: No such module "Unsubst". They complete one orbit about their common centre of mass every 260 years.[3]
μ1 and μ2 Boötis are separated by Script error: No such module "val". as of 2023,[9] with matching parallaxes and proper motions, suggesting they form a system. However, components BC have a different chemical composition compared to the A pair, confirming that they are not in a common system. The are likely be a close encounter between two binary systems.[3] Before being found to be separated systems, they were often called μ1 Boötis and μ2 Boötis, μ1 referring to components Aa and Ab, and μ1 referring to components and BC (or B).[9][3]
Nomenclature
μ Boötis (Latinised to Mu Boötis) is the star's Bayer designation. It also bears the Flamsteed designation 51 Boötis.
The system's traditional name Alkalurops is from the Greek καλαύροψ kalaurops "a herdsman's crook or staff", with the Arabic prefix attached.[10] It has also been known as Inkalunis (from the Alfonsine tables), Clava (Latin 'the club') and Venabulum (Latin 'a hunting spear').[11] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[12] to catalogue and standardize proper names for stars. The WGSN approved the name Alkalurops for μ¹ Boötis on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[8]
It is known as 七公六, Qī Gōng liù (the Sixth Star of the Seven Excellencies) in Chinese.[13]
Gallery
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Mu Bootis (Alkalurops) as seen in a small telescope
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Illustration of Mu1,2 Boötis
References
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- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b Script error: No such module "citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日 Template:Webarchive
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