40 Persei

40 Persei is a wide binary star[13] system in the northern constellation of Perseus. It has the Bayer designation ο Persei, while 40 Persei is the Flamsteed designation. The system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.97.[2] It is located approximately 1060 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6] The system is a member of the Perseus OB2 association of co-moving stars.[14]

This article is about o Persei. It is not to be confused with ο (omicron) Persei.
40 Persei
Location of 40 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension  03h 42m 22.64555s[1]
Declination 33° 57′ 54.0893″[1]
Apparent magnitude (V) 4.97[2]
Characteristics
Spectral type B0.5V[3] + A1Vn[4]
U−B color index −0.84[5]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)+22.00[6] km/s
Proper motion (μ) RA: +2.71[1] mas/yr
Dec.: −5.91[1] mas/yr
Parallax (π)3.09 ± 0.21[1] mas
Distance1,060 ± 70 ly
(320 ± 20 pc)
Absolute magnitude (MV)−2.26[2]
Details
40 Per A
Mass12.5[7] M☉
Luminosity936[2] L☉
Surface gravity (log g)4.36[8] cgs
Temperature29,330[9] K
Metallicity [Fe/H]−0.43[2] dex
Rotational velocity (v sin i)10[10] km/s
Age7.2[11] Myr
Other designations
40 Per, BD+33°698, GC 4420, HD 22951, HIP 17313, HR 1123, SAO 56646, CCDM J03424+3358A, WDS J03424+3358A[12]
Database references
SIMBADdata

The primary component is a massive B-type main-sequence star with a stellar classification of B0.5V.[3] It is about 7.2[11] million years old and has a very low projected rotational velocity for an early B-type star,[15] measured at 10 km/s.[10] This star has 12.5[7] times the mass of the Sun and is radiating 936[2] times the Sun's luminosity from its photosphere at an effective temperature of 29,330 K.[9] The companion is magnitude 10.04, A-type main-sequence star with a class of A1Vn, and is located at an angular separation of 19.8″ from the primary.[4]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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. Vizier catalog entry
  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. 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
  5. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. Tetzlaff, N.; et al. (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. Soubiran, Caroline; et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  9. Zorec, J.; et al. (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. Abt, Helmut A.; et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  11. Seyfert, C. K.; et al. (July 1960). "A Study of the II Persei Association". Astrophysical Journal. 132: 58. Bibcode:1960ApJ...132...58S. doi:10.1086/146900.
  12. "40 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-18.
  13. 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.
  14. Lesh, J. R. (September 1969). "Internal motions in the associations II Per and I Lac". Astronomical Journal. 74: 891–898. Bibcode:1969AJ.....74..891L. doi:10.1086/110878.
  15. Guthrie, B. N. G. (September 1984). "The rotation of early B-type stars and the problem of star formation". Monthly Notices of the Royal Astronomical Society. 210: 159–171. Bibcode:1984MNRAS.210..159G. doi:10.1093/mnras/210.1.159.
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