Epsilon Scorpii
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end Epsilon Scorpii (ε Scorpii, abbreviated Eps Sco, ε Sco), formally named Larawag Template:IPAc-en,[1] is a star in the southern zodiac constellation of Scorpius. It has an apparent visual magnitude of +2.3,[2] making it the fifth-brightest member of the constellation. Parallax measurements made during the Hipparcos mission provide an estimated distance to this star of around Template:Convert from the Sun.[3]
Epsilon Scorpii has a stellar classification of K1 III,[4] which indicates it has exhausted the supply of hydrogen at its core and evolved into a giant star. The interferometry-measured angular diameter of this star, after correcting for limb darkening, is Template:Nowrap,[5] which, at its estimated distance, equates to a physical radius of nearly 13 times the radius of the Sun.[6] Presently it is generating energy through the nuclear fusion of helium at its core, which, considering the star's composition, places it along an evolutionary branch termed the red clump.[7] The star's outer atmosphere has an effective temperature of 4,560 K,[8] giving it the orange hue of a cool K-type star.
ε Scorpii is classified as a suspected variable star,[9] although a study of Hipparcos photometry showed a variation of no more than 0.01–0.02 magnitudes.[7] It is an X-ray source with a luminosity of Template:Nowrap.[10][11]
Nomenclature
ε Scorpii (Latinised to Epsilon Scorpii) is the star's Bayer designation.
The star bore the traditional name Larawag in the culture of the Wardaman people of the Northern territory of Australia,[12] meaning clear sighting.[13] In 2016, the IAU organized a Working Group on Star Names (WGSN)[14] to catalog and standardize proper names for stars. The WGSN approved the name Larawag for Epsilon Scorpii on 19 November 2017 and it is now so included in the List of IAU-approved Star Names.[1]
Patrick Moore introduced the name Wei as Chinese name for this star.[15] However, this seems to be a misreading, as Chinese Template:Lang (Template:Lang, English Tail) refers to an asterism (i.e. Chinese constellation) consisting of Epsilon Scorpii, Mu¹ Scorpii, Zeta¹ Scorpii and Zeta² Scorpii, Eta Scorpii, Theta Scorpii, Iota² Scorpii and Iota¹ Scorpii, Kappa Scorpii, Lambda Scorpii and Upsilon Scorpii.[16] Consequently, the name for Epsilon Scorpii itself is Template:Lang (Template:Lang), which means "the Second Star of Tail".[17][18]
In culture
Epsilon Scorpii appears on the flag of Brazil, symbolising the state of Ceará.[19]
References
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<ref>tag; no text was provided for refs namedmoore1983 - ↑ 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.
- ↑ 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.
- ↑ Ridpath, Ian, Star Tales.
- ↑ Template:Cite web