21 Persei

21 Persei


Location of 21 Persei (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 57m 17.28220s[1]
Declination 31° 56′ 03.1871″[1]
Apparent magnitude (V) 5.10[2]
Characteristics
Spectral type B9pSi[3]
U−B color index -0.24[4]
B−V color index -0.01[4]
Variable type α² CVn[5]
Astrometry
Radial velocity (Rv)+8.50[6] km/s
Proper motion (μ) RA: +2.55[1] mas/yr
Dec.: -31.15[1] mas/yr
Parallax (π)10.20 ± 0.27[1] mas
Distance320 ± 8 ly
(98 ± 3 pc)
Absolute magnitude (MV)0.14[2]
Details
Mass3.57[7] M☉
Luminosity88.65[2] L☉
Surface gravity (log g)4.05[7] cgs
Temperature12,585[7] K
Metallicity [Fe/H]+0.90[8] dex
Rotational velocity (v sin i)20[7] km/s
Other designations
LT Per, BD+31°509, FK5 2205, GC 3544, HIP 13775, HR 873, HD 18296, SAO 56031
Database references
SIMBADdata

21 Persei is a star in the constellation Perseus. Its apparent magnitude is 5.10. Located around 98.03 parsecs (319.7 ly) distant, it is a hot blue star of spectral type B9.[9] The star is an Alpha2 Canum Venaticorum variable, meaning that the star has a strong magnetic field chromium, silicon, and strontium spectral lines. 21 Persei's period is approximately 2.88 days[10]

References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 Freely accessible. 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. 1 2 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. ↑ 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.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. 1 2 3 4 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. Bibcode:2015ApJ...804..146D. arXiv:1501.03154 Freely accessible. doi:10.1088/0004-637X/804/2/146. 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. Bibcode:2011A&A...525A..71W. arXiv:1009.1491 Freely accessible. doi:10.1051/0004-6361/201015014.
  9. ↑ "LT Persei". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 28 December 2013.
  10. ↑ Catalano, F. A.; Renson, P.; Leone, F. (1993). "Third supplement to the catalogue of observed periods of Ap stars" (PDF). Astronomy and Astrophysics Supplement Series. 98 (2): 269–273. Bibcode:1993A&AS...98..269C.


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