3 Boötis is a close binary star system in the northern constellation of Boötes,[6] located 310 light years away from the Sun based upon parallax.[1] It can be viewed with the naked eye in excellent seeing conditions as a dim star with an apparent visual magnitude of 5.97.[2] The system is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 46m 43.32359s[1] |
| Declination | +25° 42′ 08.0548″[1] |
| Apparent magnitude (V) | 5.97[2] |
| Characteristics | |
| Evolutionary stage | HG + MS[3] |
| Spectral type | kA9hF6mF6[4] (A7 V: + G5 III:[5] or F2p + G0 IV[3]) |
| B−V color index | 0.523±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | 11.9±0.9[2] km/s |
| Proper motion (μ) | RA: −18.564[1] mas/yr Dec.: −59.093[1] mas/yr |
| Parallax (π) | 10.5064 ± 0.0425 mas[1] |
| Distance | 310 ± 1 ly (95.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.21[2] |
| Orbit[3] | |
| Period (P) | 36.006 d |
| Eccentricity (e) | 0.543±0.002 |
| Inclination (i) | 74.5±2.0° |
| Semi-amplitude (K1) (primary) | 52.30±0.19 km/s |
| Semi-amplitude (K2) (secondary) | 59.0±0.6 km/s |
| Details | |
| 3 Boo A | |
| Mass | 1.8[3] M☉ |
| Radius | 3.7[3] R☉ |
| Temperature | 5,848[3] K |
| 3 Boo A | |
| Mass | 1.6[3] M☉ |
| Radius | 2.6[3] R☉ |
| Temperature | 6,745[3] K |
| Age | 1.5[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a double-lined spectroscopic binary system with an orbital period of 36 days and an eccentricity of 0.543. The orbital plane is inclined 74.5° and the system does not form an eclipsing binary. The primary component is an evolving star currently in the Hertzsprung gap. Its companion is a main sequence star. Both members have more mass than the Sun and they are around 1.5 billion years old.[3]
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 e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g h i j k Eggleton, Peter P.; Yakut, Kadri (July 2017), "Models for 60 double-lined binaries containing giants", Monthly Notices of the Royal Astronomical Society, 468 (3): 3533−3556, arXiv:1611.05041, Bibcode:2017MNRAS.468.3533E, doi:10.1093/mnras/stx598, S2CID 119476544.
- ^ Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
- ^ Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific, 91: 83–86, Bibcode:1979PASP...91...83C, doi:10.1086/130446.
- ^ a b "3 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-10.