| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15 05 25.83464 |
| Declination | +48° 09′ 03.4943″ |
| Apparent magnitude (V) | 5.581 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A0 Vs |
| B−V color index | −0.005±0.003 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −12.63±0.73 km/s |
| Proper motion (μ) | RA: −65.912 mas/yr Dec.: +28.641 mas/yr |
| Parallax (π) | 12.4980 ± 0.0766 mas |
| Distance | 261 ± 2 ly (80.0 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.97 |
| Details | |
| 47 Boo A | |
| Mass | 2.46±0.02 M☉ |
| Radius | 1.8 R☉ |
| Luminosity | 45.7+2.2 −2.0 L☉ |
| Surface gravity (log g) | 4.32 cgs |
| Temperature | 10,130 K |
| Rotational velocity (v sin i) | 54.8±1.6 km/s |
| Other designations | |
| k Boo, 47 Boo, NSV 6934, BD+48°2262, FK5 1395, GC 20308, HD 133962, HIP 73841, HR 5627, SAO 45370, ADS 9500, CCDM 15054+4809 | |
| Database references | |
| SIMBAD | data |
47 Boötis is a binary star system in the northern constellation of Boötes, located 261 light years away from the Sun. It has the Bayer designation k Boötis; 47 Boötis is the Flamsteed designation. The system is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 5.58. It is moving closer to the Earth with a heliocentric radial velocity of −13 km/s.
The primary member of the system, designated component A, is an A-type main-sequence star with a stellar classification of A0 Vs. The 's' indicates sharp lines as it has a moderate rotation rate with a projected rotational velocity of 55 km/s. It is a suspected variable star of unknown type. The star has 2.46 times the mass of the Sun and is radiating 46 times the Sun's luminosity from its photosphere at an effective temperature of 10,130 K.
The companion, component B, is a magnitude 13.3 star located at an angular separation of 6.2 arcseconds away from the primary.
References
- ^ 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.
- ^ Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, S2CID 54511685, A84.
- ^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ Abt, H. A. (1981), "Visual multiples. VII. MK classifications", The Astrophysical Journal Supplement Series, 45: 437, Bibcode:1981ApJS...45..437A, doi:10.1086/190719.
- ^ 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.
- Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S.
- Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ "k Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
- ^ 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.
- Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
