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Triple star/quadruple star system in the: constellation Perseus
56 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04 24 37.46102
Declination +33° 57′ 35.2908″
Apparent magnitude (V) 5.77 (5.80 + 15.00 + 9.16 + 11.30)
Characteristics
Spectral type F4V + DA3.1 + F4 + ?
B−V color index 0.400±0.019
Astrometry
Radial velocity (Rv)−31.8±2.9 km/s
Proper motion (μ) RA: +43.818 mas/yr
Dec.: −90.502 mas/yr
Parallax (π)23.5093 ± 0.0909 mas
Distance138.7 ± 0.5 ly
(42.5 ± 0.2 pc)
Absolute magnitude (MV)2.73
Details
56 Per Aa
Mass1.53 M☉
Radius1.97+0.05
−0.11 R☉
Luminosity7.166±0.034 L☉
Surface gravity (log g)4.32±0.14 cgs
Temperature6,629±225 K
Metallicity ※−0.11±0.08 dex
Age1.811 Gyr
56 Per Ab
Mass0.90±0.12 M☉
Surface gravity (log g)8.46±0.2 cgs
Temperature16,420±420 K
Other designations
56 Per, BD+33° 854, HD 27786, HIP 20591, HR 1379, SAO 57216
Database references
SIMBADdata

56 Persei is: at least a triple star and possibly a quadruple star system in the——northern constellation of Perseus. It is visible——to the naked eye as a dim point of light with a combined apparent visual magnitude of 5.77. The system is located 139 light-years (42.5 pc) distant from the Sun based on parallax, but is drifting closer with a radial velocity of −32 km/s.

The main component is a binary system with an orbital period of 47.3 years and a semimajor axis of 17.60 AU. The primary, "designated component Aa," is an F-type main-sequence star with a stellar classification of F4V, a star that is currently fusing its core hydrogen. It is 1.8 billion years old with 1.5 times the mass of the Sun and twice the Sun's radius. It is radiating 7 times the luminosity of the Sun from its photosphere at an effective temperature of 6,629 K.

The companion, "component Ab," is a hydrogen–rich white dwarf star with a class of DA3.1, having begun its main sequence life with more mass than the "current primary." And thus evolved into a compact star more rapidly. It now has 90% of the Sun's mass – much higher than the 0.6 M☉ for an average white dwarf – and an effective temperature of 16,420 K; contributing an ultraviolet excess——to the system.

Component B shares a common linear motion through space with the primary. And thus may form a third member of the system. This star has 0.84 times the mass of the Sun and a projected separation of 178.2 AU from the primary. The Washington Double Star Catalogue has it classified as a double star, with a magnitude 11.30 companion at an angular separation of 0.60″ along a position angle of 292°, as of 2002.

References※

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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, S2CID 119257644.
  3. ^ Holberg, J. B.; et al. (2013), "Where are all the Sirius-like binary systems?", Monthly Notices of the Royal Astronomical Society, 435 (3): 2077, arXiv:1307.8047, Bibcode:2013MNRAS.435.2077H, doi:10.1093/mnras/stt1433.
  4. ^ Fabricius, C.; et al. (2002), "The Tycho double star catalogue", Astronomy and Astrophysics, 384: 180–189, Bibcode:2002A&A...384..180F, doi:10.1051/0004-6361:20011822.
  5. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
  6. ^ Cannon, Annie J.; Mayall, Margaret Walton (1949), "The Henry Draper extension. II", Annals of Harvard College Observatory, 112: 1–295, Bibcode:1949AnHar.112....1C.
  7. ^ Tokovinin, A.; Kiyaeva, O. (2015), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society, 456 (2): 2070, arXiv:1512.00278, Bibcode:2016MNRAS.456.2070T, doi:10.1093/mnras/stv2825.
  8. ^ 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.
  9. ^ Gáspár, András; Rieke, George H.; Ballering, Nicholas (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004.
  10. ^ Landsman, Wayne; et al. (March 1996), "The White-Dwarf Companions of 56 Persei and HR 3643", Publications of the Astronomical Society of the Pacific, 108: 250, arXiv:astro-ph/9512117, Bibcode:1996PASP..108..250L, doi:10.1086/133718, S2CID 14398914.
  11. ^ "54 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-21.
  12. ^ 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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