9 Persei

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 5.17.[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]

This article is about i Persei. It is not to be confused with ι (iota) Persei or l Persei.
9 Persei
Location of 9 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension  02h 22m 21.43482s[1]
Declination 55° 50′ 44.3518″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type A2 Ia[3]
U−B color index −0.11[2]
B−V color index +0.37[2]
Variable type α Cyg[4]
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[1] mas
Distanceapprox. 4,300 ly
(approx. 1,300 pc)
Absolute magnitude (MV)−4.73[6]
Details
Mass10.5[7] M☉
Radius88.9+3.8
−2.8[1] R☉
Luminosity12,331±2,189[1] L☉
Surface gravity (log g)1.74[8] cgs
Temperature9,840[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
SIMBADdata

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, a type of non-radial pulsating variable, and it ranges in magnitude from 5.15 down to 5.25.[13] 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.[14]

The Double Cluster. 9 Persei is the brightest star on right side of the image. North is to the left.

References
  1. 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.
  2. 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.
  3. 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.
  4. 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....1.2025S.
  5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. 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.
  7. 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: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  8. 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.
  9. 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: 297. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147.
  10. "9 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 26, 2019.
  11. 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.
  12. 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.
  13. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S.
  14. 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
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