55 Persei

55 Persei in optical light
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 24m 29.1556s[1]
Declination +34° 07′ 50.728″[1]
Apparent magnitude (V) 5.73[2]
Characteristics
Spectral type B8 V[2]
B−V color index −0.054±0.004[2]
Astrometry
Radial velocity (Rv)+8.5±3.5[3] km/s
Proper motion (μ) RA: +21.092 [1] mas/yr
Dec.: −34.137 [1] mas/yr
Parallax (π)8.50 ± 0.38 mas[4]
Distance380 ± 20 ly
(118 ± 5 pc)
Absolute magnitude (MV)−0.39[5]
Details
Mass3.44±0.07[6] M☉
Radius3.0[7] R☉
Luminosity193+24
−21[6] L☉
Temperature12,246±85[6] K
Rotational velocity (v sin i)288[6] km/s
Age197[5] Myr
Other designations
55 Per, BD+33° 853, HD 27777, HIP 20579, HR 1377, SAO 57212[8]
Database references
SIMBADdata

55 Persei is a single,[9] blue-white hued star in the northern constellation Perseus. It is faintly visible to the naked eye under good seeing conditions, having an apparent visual magnitude of 5.73.[2] Based upon an annual parallax shift of 8.50±0.38 mas[4] as seen from Earth's orbit, the star is located about 380 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.39[5] due to interstellar dust.

This is a B-type main-sequence star with a stellar classification of B8 V;[2] a massive star that is generating energy through hydrogen fusion at its core. It has 3.44[6] times the mass of the Sun and about 3[7] times the Sun's radius. The star is about 197[5] million years old and is spinning rapidly with a projected rotational velocity of 288 km/s.[6] It is radiating roughly 193[6] times the Sun's luminosity from its photosphere at an effective temperature of 12,246 K.[6]

References

  1. 1 2 3 4 Brown, A. G. A; et al. (2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties", Astronomy and Astrophysics, 595, A2, arXiv:1609.04172, Bibcode:2016A&A...595A...2G, doi:10.1051/0004-6361/201629512, S2CID 1828208.
  2. 1 2 3 4 5 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.
  3. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  4. 1 2 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.
  5. 1 2 3 4 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  6. 1 2 3 4 5 6 7 8 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  7. 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. ↑ "55 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-08.
  9. ↑ 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.
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