Mu Andromedae
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Mu Andromedae is a binary star system in the northern constellation of Andromeda. Its Bayer designation is Latinized from μ Andromedae, and abbreviated Mu And or μ And, respectively. The system has an apparent visual magnitude of 3.87,[2] making it readily visible to the naked eye. Based upon parallax measurements, it is located at a distance of approximately Script error: No such module "convert". from Earth.[1] In the constellation, the star is situated about halfway between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.[12]
The spectrum of this star matches a stellar classification of A5 V,[3] indicating that it is an A-type main sequence star. It has 2.2 times the mass of the Sun and three times the Sun's radius. The star is radiating about 40 times the luminosity of the Sun from its outer envelope at an effective temperature of 8,320 K,[7] giving it the characteristic white glow of an A-type star.[13] It is estimated to be about 724 million years old,[7] with a relatively high projected rotational velocity of 75 km/s.[10]
In 2007, Mu Andromedae was found to be a tidally-locked close binary system with an unseen companion. The two stars orbit each other every 550.7 days. The tidal interactions have spun up the primary star, causing it to become magnetically active and host unusually strong starspots.[4]
Naming
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Legs (asterism), refers to an asterism consisting of μ Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for μ Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[14]
References
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- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Script error: No such module "webarchive".
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External links
- http://www.alcyone-software.com/cgi-bin/search.pl?object=HR0269 Script error: No such module "webarchive".
- Image μ Andromedae