Astronomy:40 Persei

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Short description: Star in the constellation Perseus
40 Persei
Perseus IAU.svg
Red circle.svg
Location of 40 Persei (circled)
Observation data
Equinox J2000.0]] (ICRS)
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

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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  3. ↑ 3.0 3.1 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. ↑ 4.0 4.1 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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry
  5. ↑ 5.0 5.1 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. ↑ 6.0 6.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 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 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.  Vizier catalog entry
  8. ↑ Soubiran, Caroline et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S. 
  9. ↑ 9.0 9.1 Zorec, J. et al. (2009). "Fundamental parameters of B supergiants from the BCD system". Astronomy and Astrophysics 501 (1): 297–320. doi:10.1051/0004-6361/200811147. Bibcode: 2009A&A...501..297Z. 
  10. ↑ 10.0 10.1 Abt, Helmut A. et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. Bibcode: 2002ApJ...573..359A. 
  11. ↑ 11.0 11.1 Seyfert, C. K. et al. (July 1960). "A Study of the II Persei Association". Astrophysical Journal 132: 58. doi:10.1086/146900. Bibcode: 1960ApJ...132...58S. 
  12. ↑ "40 Per". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=40+Per. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Lesh, J. R. (September 1969). "Internal motions in the associations II Per and I Lac.". Astronomical Journal 74: 891–898. doi:10.1086/110878. Bibcode: 1969AJ.....74..891L. 
  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. doi:10.1093/mnras/210.1.159. Bibcode: 1984MNRAS.210..159G. 



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