Astronomy:6 Persei

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Short description: Star in the constellation Andromeda
6 Persei
Location of 6 Persei (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  02h 13m 36.34084s[2]
Declination +51° 03′ 56.8222″[2]
Apparent magnitude (V) 5.29[3]
Characteristics
Spectral type G8.5 IIIb Fe-2[3]
B−V color index 0.926[4]
Astrometry
Radial velocity (Rv)+41.82±0.27[5] km/s
Proper motion (μ) RA: +344.397[2] mas/yr
Dec.: −164.853[2] mas/yr
Parallax (π)17.8901 ± 0.0943[2] mas
Distance182.3 ± 1.0 ly
(55.9 ± 0.3 pc)
Absolute magnitude (MV)+1.25±0.07[6]
Orbit[6]
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[4]
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, PPM 27263, WDS J02136+5104A[7]
Database references
SIMBADdata

6 Persei is a binary star[8] system in the northern constellation of Andromeda.[9] It is faintly visible to the naked eye with an apparent visual magnitude of 5.29.[3] The system is located 182 light years from Earth, as determined from its annual parallax shift of 17.9 mas.[2] It is moving further away with a heliocentric radial velocity of +42 km/s.[5] The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.386 arcsecond/year.[10]

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°.[6]

The visible component is an evolved giant star with a stellar classification of G8.5 IIIb Fe-2,[3] 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.[4] It has a magnitude 10.49 visual companion at an angular separation of 108.9″ along a position angle of 57°, as of 2004.[11]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  4. ↑ 4.0 4.1 4.2 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  5. ↑ 5.0 5.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ 6.0 6.1 6.2 Scarfe, C. D. (October 2017), "Spectroscopic Orbits of Three Binaries", Revista Mexicana de Astronomía y Astrofísica 53: 333–347, Bibcode: 2017RMxAA..53..333S. 
  7. ↑ "HD 13530". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+13530. 
  8. ↑ 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. 
  9. ↑ 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. 
  10. ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L. 
  11. ↑ 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, doi:10.1086/323920, Bibcode: 2017yCat....102026M. 



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