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]
| 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 mas[1] |
| Distance | 182.3 ± 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] | |
| Mass | 1.5 M☉ |
| Radius | 7 R☉ |
| Luminosity | 26.3 L☉ |
| Surface gravity (log g) | 3.0 cgs |
| Temperature | 4,920 K |
| Metallicity [Fe/H] | −0.60 dex |
| Rotational velocity (v sin i) | 0.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ a b c d e f 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.
- ^ a b c d 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.
- ^ a b c 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.
- ^ a b 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.
- ^ a b c Scarfe, C. D. (October 2017), "Spectroscopic Orbits of Three Binaries", Revista Mexicana de Astronomía y Astrofísica, 53: 333–347, Bibcode:2017RMxAA..53..333S.
- ^ "HD 13530". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 August 2018.
- ^ 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.
- ^ Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 1, Sky Publishing Corporation and the European Space Agency, p. 81, ISBN 0-933346-82-4.
- ^ 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, S2CID 2603568.
- ^ 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.