[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/9-persei-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki43\/9-persei-wikipedia\/","headline":"9 Persei – Wikipedia","name":"9 Persei – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Blue supergiant star in the constellation Perseus 9 Persei after-content-x4 Location of 9","datePublished":"2014-01-08","dateModified":"2014-01-08","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/ef\/Perseus_constellation_map.svg\/280px-Perseus_constellation_map.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/ef\/Perseus_constellation_map.svg\/280px-Perseus_constellation_map.svg.png","height":"280","width":"280"},"url":"https:\/\/wiki.edu.vn\/en\/wiki43\/9-persei-wikipedia\/","wordCount":5076,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Blue supergiant star in the constellation Perseus9 Persei       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Location of 9 Persei (circled)Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationPerseusRight ascension02h 22m 21.43482s[1]Declination55\u00b0\u00a050\u2032\u00a044.3518\u2033[1]Apparent\u00a0magnitude\u00a0(V)5.15 – 5.25[2]CharacteristicsSpectral\u00a0typeA2\u00a0Ia[3]U\u2212B color index\u22120.11[4]B\u2212V color index+0.37[4]Variable\u00a0type\u03b1 Cyg[2]AstrometryRadial velocity (Rv)\u221215.20[5]\u00a0km\/sProper motion (\u03bc) RA:\u00a0+0.374[1]\u00a0mas\/yr Dec.:\u00a0\u22121.798[1]\u00a0mas\/yr Parallax (\u03c0)0.7603\u00a0\u00b1\u00a00.1139\u00a0mas[1]Distanceapprox. 4,300\u00a0ly (approx. 1,300\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)\u22124.73[6]DetailsMass10.5[7]\u00a0M\u2609Radius88.9+3.8\u22122.8[1]\u00a0R\u2609Luminosity12,331\u00b12,189[1]\u00a0L\u2609Surface gravity (log\u00a0g)1.74[8]\u00a0cgsTemperature9,840[9]\u00a0KMetallicity [Fe\/H]+0.26[8]\u00a0dexRotational velocity (v\u00a0sin\u00a0i)25[3]\u00a0km\/sOther designations i Persei, 9 Per, V474 Per, BD+55\u00b0598, FK5\u00a02159, GC\u00a02836, HD\u00a014489, HIP\u00a011060, HR\u00a0685, SAO\u00a023256, CCDM J02224+5551A, WDS J02224+5551A[10]Database referencesSIMBADdata  The Double Cluster. 9 Persei is the brightest star on right side of the image. North is to the left.9 Persei is a single[11]variable star in the northern constellation Perseus, located around 4,300\u00a0light years away from the Sun. It has the Bayer designation i Persei; 9 Persei is the Flamsteed designation. This body is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of about 5.2. It is moving closer to the Sun with a heliocentric radial velocity of \u221215.2\u00a0km\/s.[5] The star is a member of the Perseus OB1 association of co-moving stars.[12]         (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4A light curve for V474 Persei. The main plot shows the variation over a year, and the inset plot shows the same data folded over the best-fit period. The data was published by Burggraaff et al. (2018)[13]This is a blue supergiant with a stellar classification of A2\u00a0Ia,[3] a massive star that has used up its core hydrogen and is now fusing heavier elements. It is an Alpha Cygni variable (designated V474 Persei), a type of non-radial pulsating variable. It ranges in magnitude from 5.15 down to 5.25.[14] The star has 10.5[7] times the mass of the Sun and has expanded to 89[1] times the Sun’s radius. It is radiating over 12,000[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 9,840\u00a0K.[9]9 Persei has one visual companion, designated component B, at an angular separation of 12.3\u2033 and magnitude 12.0.[15]References[edit]^ a b c d e f g h i Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051\/0004-6361\/201833051. Gaia DR2 record for this source at VizieR.^ a b Samus, N. N.; Durlevich, O. V.;  et\u00a0al. (2009). “VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)”. VizieR On-line Data Catalog: B\/GCVS. Originally Published in: 2009yCat….102025S. 1. Bibcode:2009yCat….1.2025S.^ a b c Hoffleit, D.; Warren, W. H. (1995). “VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)”. VizieR On-line Data Catalog: V\/50. Originally Published in: 1964BS….C……0H. 5050. Bibcode:1995yCat.5050….0H.^ a b Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS\/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.^ a b Wilson, R. E. (1953). “General Catalogue of Stellar Radial Velocities”. Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C……0W. ISBN\u00a09780598216885. LCCN\u00a054001336.^ Huang, W.;  et\u00a0al. (2012), “A catalogue of Paschen-line profiles in standard stars”, Astronomy & Astrophysics, 547: A62, arXiv:1210.7893, Bibcode:2012A&A…547A..62H, doi:10.1051\/0004-6361\/201219804, S2CID\u00a0119286159.^ a b Tetzlaff, N.; Neuh\u00e4user, R.; Hohle, M. M. (2011). “A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun”. Monthly Notices of the Royal Astronomical Society. 410 (1): 190\u2013200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111\/j.1365-2966.2010.17434.x. S2CID\u00a0118629873. Vizier catalog entry^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). “Coud\u00e9-feed stellar spectral library \u2013 atmospheric parameters”. Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A…525A..71W. doi:10.1051\/0004-6361\/201015014. S2CID\u00a053480665.^ a b Zorec, J.; Cidale, L.; Arias, M. L.; Fr\u00e9mat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). “Fundamental parameters of B supergiants from the BCD system”. Astronomy and Astrophysics. 501: 297\u2013320. arXiv:0903.5134. Bibcode:2009A&A…501..297Z. doi:10.1051\/0004-6361\/200811147. S2CID\u00a014969137.^ “9 Hya”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved April 26, 2019.^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), “A catalogue of multiplicity among bright stellar systems”, Monthly Notices of the Royal Astronomical Society, 389 (2): 869\u2013879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111\/j.1365-2966.2008.13596.x, S2CID\u00a014878976.^ Lee, Hsu-Tai; Lim, Jeremy (June 2008). “On the Formation of Perseus OB1 at High Galactic Latitudes”. The Astrophysical Journal. 679 (2): 1352\u20131363. arXiv:0804.4520. Bibcode:2008ApJ…679.1352L. doi:10.1086\/587801. S2CID\u00a014252530.^ Burggraaff, O.; Talens, G. J. J.; Spronck, J.; Lesage, A. L.; Stuik, R.; Otten, G. P. P. L.; Van Eylen, V.; Pollacco, D.; Snellen, I. A. G. (September 2018). “Studying bright variable stars with the Multi-site All-Sky CAmeRA (MASCARA)”. Astronomy and Astrophysics. 617: A32. Bibcode:2018A&A…617A..32B. doi:10.1051\/0004-6361\/201833142.^ Samus, N. N.;  et\u00a0al. (2017), “General Catalogue of Variable Stars”, Astronomy Reports, 5.1, 61 (1): 80\u201388, Bibcode:2017ARep…61…80S, doi:10.1134\/S1063772917010085, S2CID\u00a0125853869.^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). “The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog”. The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ….122.3466M. doi:10.1086\/323920. 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