34 Persei


34 Persei is a binary star[3] system in the northern constellation of Perseus. It is visible to the naked eye as a faint, blue-white hued point of light with a combined apparent visual magnitude of 4.67.[2] The system is located approximately 540 light years away from the Sun based on parallax,[1] but it is drifting closer with a radial velocity of −3.5 km/s.[6] It is a likely member of the Alpha Persei Cluster.[11]

34 Persei
Perseus constellation map.svg
Red circle.svg
Location of 34 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 29m 22.05019s[1]
Declination 49° 30′ 32.2114″[1]
Apparent magnitude (V) 4.67[2] (4.76 + 7.18)[3]
Spectral type B3V[4]
U−B color index −0.57[5]
B−V color index −0.09[5]
Radial velocity (Rv)−3.50[6] km/s
Proper motion (μ) RA: +22.20[1] mas/yr
Dec.: −29.49[1] mas/yr
Parallax (π)6.05 ± 0.36 mas[1]
Distance540 ± 30 ly
(165 ± 10 pc)
Absolute magnitude (MV)−1.62[2]
32 Per A
Mass6.9±0.1[7] M
Radius3.1[8] R
Luminosity671[2] L
Surface gravity (log g)4.076[9] cgs
Temperature16,421[9] K
Rotational velocity (v sin i)200[9] km/s
Age29.3±3.4[7] Myr
Other designations
34 Per, BD+49°945, FK5 1549, GC 4133, HD 21428, HIP 16244, HR 1044, SAO 38872, CCDM J03294+4931AB, WDS J03294+4931AB[10]
Database references

The primary member, designated component A, is a B-type main-sequence star with a stellar classification of B3V[4] and visual magnitude 4.76.[3] It is an estimated 29[7] million years old with a high rate of spin, showing a projected rotational velocity of 200 km/s.[9] The star has 6.9[7] times the mass of the Sun and about 3.1[8] times the Sun's radius. It is radiating 671[2] times the Sun's luminosity from its photosphere at an effective temperature of 16,421 K.[9]

The secondary companion, component B, has an angular separation of 0.6 from the primary and visual magnitude of 7.34.[12]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c d e 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. Vizier catalog entry
  3. ^ a b c 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.
  4. ^ a b Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.). 5050. Bibcode:1995yCat.5050....0H.
  5. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ a b c d Tetzlaff, N.; et al. (January 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.
  8. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
  9. ^ a b c d e David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
  10. ^ "34 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-12.
  11. ^ Zuckerman, B.; et al. (June 2012). "Stellar Membership and Dusty Debris Disks in the α Persei Cluster". The Astrophysical Journal. 752 (1): 12. arXiv:1204.3950. Bibcode:2012ApJ...752...58Z. doi:10.1088/0004-637X/752/1/58. S2CID 119207634. 58.
  12. ^ Mason, Brian D.; et al. (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