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−B color index
−0.11[ 4]
B−V color 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 (approx. 1,300 pc ) Absolute magnitude (MV )−4.73[ 6]
Details Mass 10.5[ 7] M ☉ Radius 88.9+3.8 −2.8 [ 1] R ☉ Luminosity 12,331± 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] km/s
Other designations i Persei ,
9 Per ,
V474 Per ,
BD +55°598,
FK5 2159,
GC 2836,
HD 14489,
HIP 11060,
HR 685,
SAO 23256,
CCDM J02224+5551A,
WDS J02224+5551A[ 10]
Database references SIMBAD data
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 light 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 −15.2 km/s.[ 5] The star is a member of the Perseus OB1 association of co-moving stars.[ 12]
A 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 Ia,[ 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 K.[ 9]
9 Persei has one visual companion , designated component B, at an angular separation of 12.3″ and magnitude 12.0.[ 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 at VizieR .
^ 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 Cite error: The named reference Ducati2002
was invoked but never defined (see the help page ).
^ 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 .
^ 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 . {{cite journal }}
: CS1 maint: unflagged free DOI (link ) 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 . 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): 869–879, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 . {{citation }}
: CS1 maint: unflagged free DOI (link )
^ 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 .
^ Cite error: The named reference Burggraaff
was invoked but never defined (see the help page ).
^ 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