Mu Andromedae
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 122 light-years (37 parsecs) 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
- ^ a b c d e Template:Cite Gaia EDR3
- ^ a b c d Page Module:Citation/CS1/styles.css has no content.Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Roettenbacher, R. M.; et al. (2016), "No Sun-like dynamo on the active star ζ Andromedae from starspot asymmetry", Nature, 533 (7602): 217–220, arXiv:1709.10107, Bibcode:2016Natur.533..217R, doi:10.1038/nature17444, PMID 27144357, S2CID 4466687.
- ^ Page Module:Citation/CS1/styles.css has no content.Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
- ^ Page Module:Citation/CS1/styles.css has no content.Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Maestro, V.; et al. (2013), "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties", Monthly Notices of the Royal Astronomical Society, 434 (2): 1321, arXiv:1306.5937, Bibcode:2013MNRAS.434.1321M, doi:10.1093/mnras/stt1092, S2CID 2361434.
- ^ Page Module:Citation/CS1/styles.css has no content.Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M.
- ^ Page Module:Citation/CS1/styles.css has no content.Gardiner, R. B.; Kupka, F.; Smalley, B. (July 1999), "Testing convection theories using Balmer line profiles of A, F, and G stars", Astronomy and Astrophysics, 347: 876–890, Bibcode:1999A&A...347..876G.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ Page Module:Citation/CS1/styles.css has no content."mu. And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-03-23.
{{cite web}}: Invalid|mode=Script error: No such module "Citation mode".(help) - ^ Page Module:Citation/CS1/styles.css has no content.Reddy, Francis (2011), Celestial Delights: The Best Astronomical Events Through 2020 (3rd ed.), Springer, p. 236, ISBN 978-1461406099.
- ^ Page Module:Citation/CS1/styles.css has no content."The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
- ^ 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".
External links
- http://www.alcyone-software.com/cgi-bin/search.pl?object=HR0269 Script error: No such module "webarchive".
- Image μ Andromedae
