Astronomy:HD 131473
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Short description: Binary star system in the constellation of Boötes
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 53m 23.34844s[2] |
| Declination | +15° 42′ 18.602″[2] |
| Apparent magnitude (V) | 6.403[3] (6.89 / 7.55)[4] |
| Characteristics | |
| Spectral type | F4IV / G1IV[5] |
| U−B color index | +0.122[3] |
| B−V color index | +0.570[3] |
| Astrometry | |
| Radial velocity (Rv) | 20.8[6] km/s |
| Proper motion (μ) | RA: −22.72[2] mas/yr Dec.: +21.58[2] mas/yr |
| Parallax (π) | 20.99 ± 0.93[2] mas |
| Distance | 155 ± 7 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 2.98[7] |
| Orbit[8] | |
| 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[9] M☉ |
| HD 131473 B | |
| Mass | 1.19[9] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
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,[5] and both are somewhat more massive than the Sun.[9] They perform a rather eccentric orbit once every 313 years.[8]
An M7.5 star 50″ from HD 131473 is a common proper motion companion. Any orbit around the inner pair would take tens of thousands of years.[11]
References
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 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. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ 5.0 5.1 Edwards, T. W. (1976). "MK classification for visual binary components". The Astronomical Journal 81: 245. doi:10.1086/111879. Bibcode: 1976AJ.....81..245E.
- ↑ 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.
- ↑ 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, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H.
- ↑ 8.0 8.1 Heintz, W. D. (July 1998), "Observations of Double Stars. XVIII.", The Astrophysical Journal Supplement Series 117 (2): 587–598, doi:10.1086/313127, Bibcode: 1998ApJS..117..587H.
- ↑ 9.0 9.1 9.2 Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 14, doi:10.1088/0004-6256/147/4/87, 87, Bibcode: 2014AJ....147...87T.
- ↑ "HD 131473". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+131473.
- ↑ Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T.
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