HD 131473
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 53m 23.34844s[1] |
| Declination | +15° 42′ 18.602″[1] |
| Apparent magnitude (V) | 6.403[2] (6.89 / 7.55)[3] |
| Characteristics | |
| Spectral type | F4IV / G1IV[4] |
| U−B color index | +0.122[2] |
| B−V color index | +0.570[2] |
| Astrometry | |
| Radial velocity (Rv) | 20.8[5] km/s |
| Proper motion (μ) | RA: −22.72[1] mas/yr Dec.: +21.58[1] mas/yr |
| Parallax (π) | 20.99 ± 0.93 mas[1] |
| Distance | 155 ± 7 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 2.98[6] |
| Orbit[7] | |
| Period (P) | 313 yr |
| Semi-major axis (a) | 1.358″ |
| Eccentricity (e) | 0.50 |
| Inclination (i) | 108.5° |
| Longitude of the node (Ω) | 12.5° |
| Periastron epoch (T) | 1824.0 |
| Argument of periastron (ω) (secondary) | 49° |
| Details | |
| HD 131473 A | |
| Mass | 1.34[8] M☉ |
| Luminosity | 5.1[9] L☉ |
| Temperature | 5,870[9] K |
| Metallicity [Fe/H] | 0.19[6] dex |
| Age | 2.5[6] Gyr |
| HD 131473 B | |
| Mass | 1.19[8] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 131473 is a binary star system in the northern constellation of Boötes. The primary is an F-type subgiant with a stellar classification of F4IV, while its companion is a G-type subgiant with a stellar classification of G1IV.[4]
References
[edit]- ^ a b c d e van Leeuwen, F. (November 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.
- ^ a b c Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 14 July 2017.
- ^ a b Edwards, T. W. (1976). "MK classification for visual binary components". The Astronomical Journal. 81: 245. Bibcode:1976AJ.....81..245E. doi:10.1086/111879.
- ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
- ^ a b c Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
- ^ Heintz, W. D. (July 1998), "Observations of Double Stars. XVIII.", The Astrophysical Journal Supplement Series, 117 (2): 587–598, Bibcode:1998ApJS..117..587H, doi:10.1086/313127.
- ^ a b Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, S2CID 56066740, 87.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
External links
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