Blue supergiant star in the constellation Perseus
9 Persei Location of 9 Persei (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Perseus Right ascension 02h 22m 21.43482s [ 1] Declination +55° 50′ 44.3518″[ 1] Apparent magnitude (V)5.15 - 5.25[ 2] Characteristics Spectral type A2 Ia[ 3] U−Bcolor index −0.11[ 4] B−Vcolor index +0.37[ 4] Variable type α Cyg [ 2] Astrometry Radial velocity (Rv )−15.20[ 5] km/s Proper motion (μ)RA: +0.374[ 1] mas /yr Dec.: −1.798[ 1] mas /yr Parallax (π)0.7603± 0.1139 mas [ 1] Distance approx. 4,300 ly pc ) Absolute magnitude (MV )−4.73[ 6] Details Mass 10.5[ 7] M ☉ Radius +3.8 [ 1] R ☉ Luminosity ± 2,189[ 1] L ☉ Surface gravity (log g )1.74[ 8] cgs Temperature 9,840[ 9] K Metallicity [Fe/H] +0.26[ 8] dex Rotational velocity (v sin i )25[ 3] Other designations i Persei ,9 Per ,V474 Per ,BD +55°598FK5 2159GC 2836HD 14489HIP 11060HR 685SAO 23256CCDM J02224+5551AWDS J02224+5551A[ 10] Database references SIMBAD data
TheDouble 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 northernconstellation Perseus , located around 4,300 light years away from the Sun. It has theBayer designation i Persei ;9 Persei is theFlamsteed designation . This body is visible to the naked eye as a faint, white-hued star with anapparent visual magnitude of about 5.2. It is moving closer to the Sun with a heliocentricradial velocity of −15.2 km/s.[ 5] Perseus OB1 association of co-moving stars.[ 12]
Alight 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 Burggraaffet al. (2018)[ 13] This is ablue supergiant with astellar classification of A2 Ia,[ 3] hydrogen and is now fusing heavier elements. It is anAlpha Cygni variable (designated V474 Persei), a type of non-radialpulsating variable . It ranges in magnitude from 5.15 down to 5.25.[ 14] [ 7] mass of the Sun and has expanded to 89[ 1] Sun's radius . It is radiating over 12,000[ 1] luminosity of the Sun from its swollenphotosphere at aneffective temperature of 9,840 K.[ 9]
9 Persei has onevisual companion , designated component B, at anangular separation of″ [ 15]
^a b c d e f g h i Brown, A. G. A. ; et al. (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 atVizieR .^a b Samus, N. N.; Durlevich, O. V.; et al. (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....102025S . ^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 9780598216885 LCCN 54001336 . {{cite journal }}:ISBN / Date incompatibility (help ) ^ Huang, W.; et al. (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 119286159 . ^a b Tetzlaff, N.; Neuhäuser, 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– 200.arXiv :1007.4883 Bibcode :2011MNRAS.410..190T .doi :10.1111/j.1365-2966.2010.17434.x S2CID 118629873 . Vizier catalog entry ^a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters".Astronomy & Astrophysics .525 : A71.arXiv :1009.1491 Bibcode :2011A&A...525A..71W .doi :10.1051/0004-6361/201015014 .S2CID 53480665 . ^a b Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). "Fundamental parameters of B supergiants from the BCD system".Astronomy and Astrophysics .501 (1):297– 320.arXiv :0903.5134 Bibcode :2009A&A...501..297Z .doi :10.1051/0004-6361/200811147 .S2CID 14969137 . ^ "9 Hya" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedApril 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– 879,arXiv :0806.2878 Bibcode :2008MNRAS.389..869E ,doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ Lee, Hsu-Tai; Lim, Jeremy (June 2008). "On the Formation of Perseus OB1 at High Galactic Latitudes".The Astrophysical Journal .679 (2):1352– 1363.arXiv :0804.4520 Bibcode :2008ApJ...679.1352L .doi :10.1086/587801 .S2CID 14252530 . ^ 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.arXiv :1806.02247 Bibcode :2018A&A...617A..32B .doi :10.1051/0004-6361/201833142 ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports , 5.1,61 (1):80– 88,Bibcode :2017ARep...61...80S ,doi :10.1134/S1063772917010085 ,S2CID 125853869 . ^ 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 Vizier catalog entry
