6 Persei

6 Persei is a binary star[7] system in the northern constellation of Andromeda.[8] It is faintly visible to the naked eye with an apparent visual magnitude of 5.29.[2] The system is located 182 light years from Earth, as determined from its annual parallax shift of 17.9 mas.[1] It is moving further away with a heliocentric radial velocity of +42 km/s.[4] The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.386 arcsecond/year.[9]

6 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 13m 36.34084s[1]
Declination +51° 03′ 56.8222″[1]
Apparent magnitude (V) 5.29[2]
Characteristics
Spectral type G8.5 IIIb Fe-2[2]
B−V color index 0.926[3]
Astrometry
Radial velocity (Rv)+41.82±0.27[4] km/s
Proper motion (μ) RA: +344.397[1] mas/yr
Dec.: −164.853[1] mas/yr
Parallax (π)17.8901 ± 0.0943[1] mas
Distance182.3 ± 1.0 ly
(55.9 ± 0.3 pc)
Absolute magnitude (MV)+1.25±0.07[5]
Orbit[5]
Period (P)1,576.23±0.04 d
Eccentricity (e)0.8828±0.0007
Inclination (i)104°
Periastron epoch (T)2,450,307.31±0.12 JD
Argument of periastron (ω)
(secondary)		266.4±0.3°
Semi-amplitude (K1)
(primary)		19.82±0.06 km/s
Details[3]
Mass1.5 M☉
Radius7 R☉
Luminosity26.3 L☉
Surface gravity (log g)3.0 cgs
Temperature4,920 K
Metallicity [Fe/H]−0.60 dex
Rotational velocity (v sin i)0.0 km/s
Other designations
NSV 747, BD+50° 481, FK5 77, HD 13530, HIP 10366, HR 645, SAO 23047, WDS J02136+5104A[6]
Database references
SIMBADdata

This is a single-lined spectroscopic binary with an orbital period of 4.3155 yr and an eccentricity of 0.88. The a sin i value for the primary is 201.8±0.9 Gm, where a is the semimajor axis and i is the orbital inclination. The inclination is estimated to be 104°.[5]

The visible component is an evolved giant star with a stellar classification of G8.5 IIIb Fe-2,[2] where the suffix notation indicates an underabundance of iron in the spectrum. It has 1.5 times the mass of the Sun and has expanded to 7 times the Sun's radius. The star is radiating 26 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,920 K.[3] It has a magnitude 10.49 visual companion at an angular separation of 108.9″ along a position angle of 57°, as of 2004.[10]

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.
  2. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  3. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  4. 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, A61.
  5. Scarfe, C. D. (October 2017), "Spectroscopic Orbits of Three Binaries", Revista Mexicana de Astronomía y Astrofísica, 53: 333–347, Bibcode:2017RMxAA..53..333S.
  6. "HD 13530". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 August 2018.
  7. 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.
  8. Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, 1, Sky Publishing Corporation and the European Space Agency, p. 81, ISBN 0-933346-82-4.
  9. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
  10. Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2017yCat....102026M, doi:10.1086/323920.
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